first commit

2023-06-02 02:41:24 +08:00
parent 6b95ca5582
commit edc6966b9d
20 changed files with 309 additions and 0 deletions
@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<module type="CPP_MODULE" version="4">
+  <component name="NewModuleRootManager">
+    <content url="file://$MODULE_DIR$" />
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+  </component>
+</module>
@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectModuleManager">
+    <modules>
+      <module fileurl="file://$PROJECT_DIR$/.idea/05_printf.iml" filepath="$PROJECT_DIR$/.idea/05_printf.iml" />
+    </modules>
+  </component>
+</project>
@@ -0,0 +1,50 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="CMakeSettings">
+    <configurations>
+      <configuration PROFILE_NAME="Debug" ENABLED="true" CONFIG_NAME="Debug" />
+    </configurations>
+  </component>
+  <component name="ChangeListManager">
+    <list default="true" id="31f10055-069d-473b-9478-0309bc257748" name="Changes" comment="" />
+    <option name="SHOW_DIALOG" value="false" />
+    <option name="HIGHLIGHT_CONFLICTS" value="true" />
+    <option name="HIGHLIGHT_NON_ACTIVE_CHANGELIST" value="false" />
+    <option name="LAST_RESOLUTION" value="IGNORE" />
+  </component>
+  <component name="ClangdSettings">
+    <option name="formatViaClangd" value="false" />
+  </component>
+  <component name="ProjectId" id="2QQgIoSTflB0TzMXNpGO2ORQeSd" />
+  <component name="ProjectViewState">
+    <option name="hideEmptyMiddlePackages" value="true" />
+    <option name="showLibraryContents" value="true" />
+  </component>
+  <component name="PropertiesComponent"><![CDATA[{
+  "keyToString": {
+    "RunOnceActivity.OpenProjectViewOnStart": "true",
+    "RunOnceActivity.ShowReadmeOnStart": "true",
+    "RunOnceActivity.cidr.known.project.marker": "true",
+    "WebServerToolWindowFactoryState": "false",
+    "cf.first.check.clang-format": "false",
+    "cidr.known.project.marker": "true",
+    "last_opened_file_path": "D:/GitHome/QianFeng/C_lang/05_printf",
+    "vue.rearranger.settings.migration": "true"
+  }
+}]]></component>
+  <component name="SpellCheckerSettings" RuntimeDictionaries="0" Folders="0" CustomDictionaries="0" DefaultDictionary="application-level" UseSingleDictionary="true" transferred="true" />
+  <component name="TaskManager">
+    <task active="true" id="Default" summary="Default task">
+      <changelist id="31f10055-069d-473b-9478-0309bc257748" name="Changes" comment="" />
+      <created>1685291143580</created>
+      <option name="number" value="Default" />
+      <option name="presentableId" value="Default" />
+      <updated>1685291143580</updated>
+      <workItem from="1685291144185" duration="50000" />
+    </task>
+    <servers />
+  </component>
+  <component name="TypeScriptGeneratedFilesManager">
+    <option name="version" value="3" />
+  </component>
+</project>
@@ -0,0 +1,6 @@
+TEMPLATE = app
+CONFIG += console
+CONFIG -= app_bundle
+CONFIG -= qt
+
+SOURCES += main.c
@@ -0,0 +1,46 @@
+#include <stdio.h>
+
+int main(int argc, char *argv[])
+{
+    int a = 100;
+
+    printf("a = %d\n",a);
+
+    printf("a = %o\n",a);   // 八进制输出
+    printf("a = %#o\n",a);  // %#o 可以输出八进制数的前导符
+
+    printf("a = %x\n",a);   // 十六进制输出
+    printf("a = %#x\n",a);
+
+    // 输出浮点型数据,float使用%f,double使用%lf
+    float b = 3.1415926;
+    double c = 2345.2345;
+    printf("b = %f\n",b);
+    printf("c = %lf\n",c);
+
+    // 输出字符，使用%c使出字符，使用%d可以输出字符的ascii码值
+    char d = 'y';
+    printf("d = %c %d\n",d,d);
+
+    char e[] = "hello world";
+    printf("e = %s\n",e);
+
+    // 输出地址，使用%p
+    int f = 999;
+    // &:取一个变量的地址，一般地址用十六进制标识
+    printf("&p = %#p\n", &f);    // 获取当前变量的地址用 %p
+
+
+    int m = 456;
+    printf("%d%d\n", m, m);
+    printf("%5d%5d\n", m, m);
+    // %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
+    printf("%05d%05d\n", m, m);
+    //%-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
+    printf("%-5d%-5d\n", m, m);
+
+    float n = 3.678;
+    printf("n = %f\n", n);
+    //%.2f:小数点后保留两位，并且可以四舍五入
+    printf("n = %.2f\n", n);
+}