交换两个变量值（未交换）
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#include <stdio.h>
void swap2Variable(int a, int b)
{
printf("a is %d,b is %d\n", a, b);
int temp;
temp = a;
a = b;
b = temp;
printf("a is %d,b is %d\n", a, b);
}
int main()
{
int num1 = 3, num2 = 5;
printf("before swap: num1 is %d, num2 is %d\n", num1, num2);
swap2Variable(num1, num2);
printf("after swap: num1 is %d, num2 is %d\n", num1, num2); // 函数执行完成后，结果没有变化
}
C
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