以下需要解释的 C 指针输出

Question

输出结果如何是 JACK？

#include <stdio.h>

int main()
{
    void *vp;
    char ch = 74, *cp = "JACK";
    int j = 65;
    vp = &ch;
    printf("%c", *(char*)vp);
    vp = &j;
    printf("%c", *(int*)vp);
    vp = cp;
    printf("%s", (char*)vp + 2);
    return 0;
}

Answer 1

vp = &ch;
printf("%c", *(char*)vp);

输出代码为74(J)的字符

vp = &j;
printf("%c", *(int*)vp);

输出代码为65(A)的字符

vp = cp;
printf("%s", (char*)vp + 2);

输出字符串“JACK”，偏移量为2(CK)

=> jack