#include<stdio.h>
double i;
int main()
{
(int)(float)(char) i;
printf("%d",sizeof(i));
return 0;
}
它显示为8。有人可以解释一下为什么显示为8吗? Typecasting是否对变量i ...产生任何影响,以便输出可能为4?
答案 0 :(得分:1)
(int)(float)(char) i;
不是i
的定义。它只是在毫无价值地使用该值。
#include <stdio.h>
double i;
int main(void) {
i; // use i for nothing
(int)i; // convert the value of i to integer, than use that value for nothing
(int)(float)i; // convert to float, then to int, then use for nothing
(int)(float)(char)i; // convert char, then to float, then to int, then use for nothing
printf("sizeof i is %d\n", (int)sizeof i);
char i; // define a new i (and hide the previous one) of type char
printf("sizeof i is %d\n", (int)sizeof i);
}