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#include<stdio.h>

void swap(int *a , int *b){
    int temp;
    *a = temp;
    *a = *b;
    *b = temp;
}

int main()
{
    int x,y;
    printf("enter the first number : ");
    scanf("%d" , &x);
    printf("enter the second number : ");
    scanf("%d" , &y);

    printf("the value of x and y before swap are %d and %d and the address of x and y are %u and %u\n" , x , y , &x , &y);
    swap(&x , &y);
    printf("the value of x and y after swap are %d and %d and the address of x and y are %u and %u\n" , x , y , &x , &y);
    return 0;
}

我尝试交换数字，当X值与Y值交换时，但Y值与X交换时，输出显示为-2。