考题一
void Exchg1(int x, int y)
{
int tmp;
tmp = x;
x = y;
y = tmp;
printf("x = %d, y = %d\n", x, y);
}
main()
{
int a = 4,b = 6;
Exchg1(a, b);
printf("a = %d, b = %d\n", a, b);
return(0);
}
输出的结果为:
x = __6__, y=__4__.
a = __4__, b=__6__.
考题二,程序代码如下:
void Exchg2(int *px, int *py)
{
int tmp = *px;
*px = *py;
*py = tmp;
printf("*px = %d, *py = %d.\n", *px, *py);
}
main()
{
int a = 4;
int b = 6;
Exchg2(&a, &b);
printf("a = %d, b = %d.\n", a, b);
return(0);
}
输出的结果为为:
*px=__6__, *py=__4__.
a=__6__, b=_4___.
问下划线的部分应是什么,请完成。
考题三,程序代码如下:
void Exchg3(int &x, int &y)
{
int tmp = x;
x = y;
y = tmp;
printf("x = %d,y = %d\n", x, y);
}
main()
{
int a = 4;
int b = 6;
Exchg3(a, b);
printf("a = %d, b = %d\n", a, b);
return(0);
}
输出的结果为:
x=__6__, y=__4__.
a=__6__, b=__4__.