申論題內容
一、C 語言中，傳遞參數的方式為「以值傳遞」（Pass by Value），試寫出下列程式之
執行結果：（20 分）
#include
void exchange1 (int a, int b)
{
int tmp;
tmp = a;
a = b;
b = tmp;
}
void exchange2 (int *a, int *b)
{
int tmp;
tmp = *a;
*a = *b;
*b = tmp;
}
main ()
{
int x, y;
x = 1;
y = 0;
exchange1(x, y);
printf(“x is %d\n”, x);
printf(“y is %d\n”, y);
exchange2(&x, &y);
printf(“x is %d\n”, x);
printf(“y is %d\n”, y);
}
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