30 lines
675 B
C
30 lines
675 B
C
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// 共用体和结构体结合使用
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// 可以解决不同类型的数据在内存中的存储问题
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#include <stdio.h>
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struct REG
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{
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unsigned char a : 1; // 低位
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unsigned char b : 1;
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unsigned char c : 1;
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unsigned char d : 1;
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unsigned char e : 1;
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unsigned char f : 1;
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unsigned char g : 1;
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unsigned char h : 1; // 高位
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};
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union REG_UNI
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{
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struct REG reg;
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unsigned char ch;
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};
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int main()
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{
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union REG_UNI reg1 = {{1, 0, 0, 0, 1, 0, 0, 0}};
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// reg1.ch 可以把每一位的值都取出来，但是不能修改，读取顺序是从低位到高位，倒序读取 0b00001001
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printf("%#x\n", reg1.ch); // 0x11
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return 0;
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}
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