sizeof计算一个结构体大小

#include <stdio.h>int main(){struct _AAA{char a;char e;double b;char c;int x;char f,g,h;short m,n;int d;}AAA;struct _BBB{double b;char a;char c;}BBB;printf("sizeof AAA is %d/n",sizeof(AAA));printf("sizeof BBB is %d/n",sizeof(BBB));return 0;}/*yuan@yuan:~/work/test> ./byte_align sizeof AAA is 24sizeof BBB is 12总结：考虑字节对齐问题，32位机，当有4个或少于4个char连续在一起时，占4 BYTE ；当两个char和一个short,或两个short连续时，也是占4 BYTE 。struct _BBB{char a;char c;char b;}BBB;结果是 3 。*/