first commit
This commit is contained in:
parent
6b95ca5582
commit
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TEMPLATE = app
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CONFIG += console
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CONFIG -= app_bundle
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CONFIG -= qt
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SOURCES += main.c
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@ -0,0 +1,7 @@
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#include <stdio.h>
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int main()
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{
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printf("Hello World!\n");
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return 0;
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}
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@ -0,0 +1,6 @@
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TEMPLATE = app
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CONFIG += console
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CONFIG -= app_bundle
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CONFIG -= qt
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SOURCES += main.c
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@ -0,0 +1,28 @@
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#include <stdio.h>
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int main(int argc, char *argv[])
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{
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// 定义一个char类型的变量并赋值，输出字符使用c%
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char a = 'w';
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printf("a = %c\n",a);
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// 定义一个short类型的变量并赋值
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short b = 100;
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printf("b = %d\n",b);
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// 定义一个int类型的变量并赋值，输出int类型变量的值使用%d
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int c = 9999;
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printf("c = %d\n",c);
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// 定义一个long类型的变量并赋值，输出long类型变量的值使用%ld
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long d = 2342341;
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printf("d = %ld\n",d);
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float e = 3.1415926;
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printf("e = %f\n",e);
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double f = 3234.234214342345;
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printf("f = %lf\n",f);
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return 0;
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}
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<?xml version="1.0" encoding="UTF-8"?>
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<module type="CPP_MODULE" version="4">
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<component name="NewModuleRootManager">
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<content url="file://$MODULE_DIR$" />
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<orderEntry type="inheritedJdk" />
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<orderEntry type="sourceFolder" forTests="false" />
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</component>
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</module>
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@ -0,0 +1,8 @@
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<?xml version="1.0" encoding="UTF-8"?>
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<project version="4">
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<component name="ProjectModuleManager">
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<modules>
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<module fileurl="file://$PROJECT_DIR$/.idea/05_printf.iml" filepath="$PROJECT_DIR$/.idea/05_printf.iml" />
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</modules>
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</component>
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</project>
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@ -0,0 +1,50 @@
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<?xml version="1.0" encoding="UTF-8"?>
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<project version="4">
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<component name="CMakeSettings">
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<configurations>
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<configuration PROFILE_NAME="Debug" ENABLED="true" CONFIG_NAME="Debug" />
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</configurations>
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</component>
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<component name="ChangeListManager">
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<list default="true" id="31f10055-069d-473b-9478-0309bc257748" name="Changes" comment="" />
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<option name="SHOW_DIALOG" value="false" />
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<option name="HIGHLIGHT_CONFLICTS" value="true" />
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<option name="HIGHLIGHT_NON_ACTIVE_CHANGELIST" value="false" />
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<option name="LAST_RESOLUTION" value="IGNORE" />
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</component>
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<component name="ClangdSettings">
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<option name="formatViaClangd" value="false" />
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</component>
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<component name="ProjectId" id="2QQgIoSTflB0TzMXNpGO2ORQeSd" />
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<component name="ProjectViewState">
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<option name="hideEmptyMiddlePackages" value="true" />
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<option name="showLibraryContents" value="true" />
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</component>
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<component name="PropertiesComponent"><![CDATA[{
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"keyToString": {
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"RunOnceActivity.OpenProjectViewOnStart": "true",
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"RunOnceActivity.ShowReadmeOnStart": "true",
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"RunOnceActivity.cidr.known.project.marker": "true",
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"WebServerToolWindowFactoryState": "false",
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"cf.first.check.clang-format": "false",
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"cidr.known.project.marker": "true",
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"last_opened_file_path": "D:/GitHome/QianFeng/C_lang/05_printf",
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"vue.rearranger.settings.migration": "true"
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}
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}]]></component>
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<component name="SpellCheckerSettings" RuntimeDictionaries="0" Folders="0" CustomDictionaries="0" DefaultDictionary="application-level" UseSingleDictionary="true" transferred="true" />
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<component name="TaskManager">
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<task active="true" id="Default" summary="Default task">
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<changelist id="31f10055-069d-473b-9478-0309bc257748" name="Changes" comment="" />
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<created>1685291143580</created>
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<option name="number" value="Default" />
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<option name="presentableId" value="Default" />
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<updated>1685291143580</updated>
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<workItem from="1685291144185" duration="50000" />
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</task>
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<servers />
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</component>
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<component name="TypeScriptGeneratedFilesManager">
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<option name="version" value="3" />
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</component>
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</project>
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@ -0,0 +1,6 @@
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TEMPLATE = app
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CONFIG += console
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CONFIG -= app_bundle
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CONFIG -= qt
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SOURCES += main.c
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@ -0,0 +1,46 @@
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#include <stdio.h>
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int main(int argc, char *argv[])
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{
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int a = 100;
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printf("a = %d\n",a);
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printf("a = %o\n",a); // 八进制输出
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printf("a = %#o\n",a); // %#o 可以输出八进制数的前导符
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printf("a = %x\n",a); // 十六进制输出
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printf("a = %#x\n",a);
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// 输出浮点型数据,float使用%f,double使用%lf
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float b = 3.1415926;
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double c = 2345.2345;
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printf("b = %f\n",b);
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printf("c = %lf\n",c);
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// 输出字符，使用%c使出字符，使用%d可以输出字符的ascii码值
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char d = 'y';
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printf("d = %c %d\n",d,d);
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char e[] = "hello world";
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printf("e = %s\n",e);
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// 输出地址，使用%p
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int f = 999;
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// &:取一个变量的地址，一般地址用十六进制标识
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printf("&p = %#p\n", &f); // 获取当前变量的地址用 %p
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int m = 456;
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printf("%d%d\n", m, m);
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printf("%5d%5d\n", m, m);
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// %05d:输出的宽度为5，右对齐，如果实际数据的宽度小于5，则左边位置补0
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printf("%05d%05d\n", m, m);
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//%-5d:输出的宽度为5，左对齐，如果实际数据的宽度小于5，则右边补空格
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printf("%-5d%-5d\n", m, m);
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float n = 3.678;
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printf("n = %f\n", n);
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//%.2f:小数点后保留两位，并且可以四舍五入
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printf("n = %.2f\n", n);
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}
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TEMPLATE = app
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CONFIG += console
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CONFIG -= app_bundle
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CONFIG -= qt
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SOURCES += main.c
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#include <stdio.h>
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int main(int argc, char *argv[])
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{
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// 定义一个一维数组
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int a[10];
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// 通过sizeof关键字可以获取数组的大小
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printf("sizeof(a) = %d %d\n", sizeof(a), 10* sizeof(int));
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// 如果定义数组的同时赋值（初始化），可以不指定数组元素的个数
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int b[] = {10, 20, 30};
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printf("sizeof(b) = %d\n",sizeof(b));
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printf("******************************\n");
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// 定义一个二维数组
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int c[2][4];
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printf("sizeof(c) = %d %d\n",sizeof(c), 2 * 4 * sizeof(int));
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// 二维数组的行数可以省略，但是列数不能省略，在初始化时可以这样操作
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// 系统会根据列数自动指定行数，最终得到的函数所得元素个数是列的整数倍
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int d[][4] = {1, 2, 3, 4, 5};
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printf("sizeof(d) = %d\n",sizeof(d));
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return 0;
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}
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@ -0,0 +1,6 @@
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TEMPLATE = app
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CONFIG += console
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CONFIG -= app_bundle
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CONFIG -= qt
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SOURCES += main.c
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@ -0,0 +1,24 @@
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#include <stdio.h>
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int main(int argc, char *argv[])
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{
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// 一维数组的初始化
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// 如果不初始化，直接使用会是随机值
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// int a[4];
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// 初始化方式1：全部初始化
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// int a[4] = {123, 78, 666, 476};
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// 如果是全部初始化，可以不指定数组元素的个数，系统会自动分配
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// int a[] = {10, 20, 30, 40};
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// 初始化方式2：局部初始化
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// 未初始化的位置的元素自动赋值为0
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int a[4] = {10, 20};
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printf("%d\n",a[0]);
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printf("%d\n",a[1]);
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printf("%d\n",a[2]);
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printf("%d\n",a[3]);
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return 0;
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}
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@ -0,0 +1,6 @@
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TEMPLATE = app
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CONFIG += console
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CONFIG -= app_bundle
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CONFIG -= qt
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SOURCES += main.c
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@ -0,0 +1,31 @@
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#include <stdio.h>
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int main(int argc, char *argv[])
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{
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// 二维数组的初始化
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// int a[2][3];
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// 初始化方式1：按行初始化
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// 全局初始化
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// int a[2][3] = {{10, 20, 30}, {666, 777, 888}};
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// 局部初始化
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// 没有赋值的位置的元素自动为0
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// int a[2][3] = {{10, 20}, {666}};
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// 初始化方式2：逐个初始化
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// 全部初始化
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// int a[2][3] = {1, 2, 3, 4, 5, 6};
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// 局部初始化
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// 没有赋值的位置的元素自动为0
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int a[2][3] = {1, 2, 3};
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printf("%d\n",a[0][0]);
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printf("%d\n",a[0][1]);
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printf("%d\n",a[0][2]);
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printf("%d\n",a[1][0]);
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printf("%d\n",a[1][1]);
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printf("%d\n",a[1][2]);
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return 0;
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}
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@ -0,0 +1,6 @@
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TEMPLATE = app
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CONFIG += console
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CONFIG -= app_bundle
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CONFIG -= qt
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SOURCES += main.c
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@ -0,0 +1,39 @@
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#include <stdio.h>
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int main(int argc, char *argv[])
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{
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// 一维数组的引用以及一维数组的遍历
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int a[6] = {111, 222, 333, 444, 555, 666};
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a[3] = 10000;
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// 一维数组的遍历
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int i;
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for(i = 0; i< sizeof(a) / sizeof(int);i++)
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{
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printf("a[%d] = %d\n",i,a[i]);
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}
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printf("************************\n");
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// 二维数组的引用以及二维数组的遍历
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int b[3][4] = {1, 2, 3, 4,
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5, 6, 7, 8,
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9, 10, 11, 12
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};
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b[2][0] = 666;
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// 二维数组的遍历
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int m, n;
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// 外层循环控制行数
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for(m = 0; m < 3; m++){
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// 内层循环控制列数
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for(n = 0; n < 4; n++){
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printf("%-4d", b[m][n]); // 宽度为4，左对齐显示
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}
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printf("\n");
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}
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return 0;
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}
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