在C / C++中,sizeof()运算符用于查找日期类型或变量的大小。用sizeof()编写的表达式永远不会执行。
例子:
// C program to demonstrate that the
// expressions written in sizeof() are
// never executed
#include
int main(){
// The printf in sizeof is not executed
// Only the return type of printf is
// considered and its size is evaluated
// by sizeof,
int a = sizeof(printf("hey"));
printf("%d", a);
return 0;
}
Output:
4
即使我们在sizeof()内分配一个值,更改也不会反映出来。
// One more C program to demonstrate that
// the expressions written in sizeof() are
// never executed
#include
int main() {
int a = 5;
int b = sizeof(a = 6);
printf("a = %d, b = %d\n", a, b);
return 0;
}
Output:
a = 5, b = 4
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