-8
 #include<stdio.h>
    double i;
    int main()
    {
    (int)(float)(char) i;
    printf("%d",sizeof(i));
    return 0;
    }

它显示输出为 8。谁能解释我为什么显示为 8。?类型转换是否对变量 i.. 有任何影响,因此输出可能是 4?

4

1 回答 1

1

(int)(float)(char) i;不是定义i。它只是无用地使用价值。

#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);
}
于 2019-09-04T14:37:19.500 回答