sizeof的实现
sizeof是一个运算符，会在编译时计算出变量的长度。
预处理指令要写在一样，如果太长可以使用续行符''。
/* Find the size of an variable */
#define sizeof_var( var ) ((size_t)(&(var)+1)-(size_t)(&(var)))
/* Find the size of a
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data type */
#define sizeof_type( type ) (size_t)((type*)1000 + 1 )-(size_t)((type*)1000)
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#include <stdio.h> #define my_sizeof(L_Value) ( (char *)(&L_Value + 1) - (char *)&L_Value ) int main() { int i; char *p1 = (char *)(&i + 1); char *p2 = (char *)&i; printf("%xn",(int)p1); printf("%xn",(int)p2); printf("the size of i is %d n",p1 - p2); return 0; } |