请问该如何进行赋值 迷茫

#include <stdio.h>
int main()
{
int a,b,c;
int y;
int t;
scanf("%d %d %d",&a,&b,&c);
y = a+2*b+3*c;
printf("%d\n",y);
//交换a b
t = a;
a = b;
b = t;
//交换b c
t = b;
b = c;
c = t;
//计算交换后的值
y = a+2*b+3*c;
printf("%d\n",y);
return 0;
}

是不会交换吗

int temp；//定义一个临时变量
temp=a;
a=b;
b=temp;  //这样就把a和b的值交换了