c - 编程查找总和，如果输入 'y'，则使用 do while 循环重复该过程

Question

这里有一条打印消息“您想再次运行吗？”询问，如果我们输入“y”，则程序将重复。

我尝试了这段代码

#include<stdio.h>
int main()
{
    int a, b, c;
    char ch;
    ch = 'y';
    printf("enter 1st and 2nd no.");
    scanf("%d%d", &a, &b);
    {
        c = a + b;
        printf("%d", c);
        printf("Do you want to run again?");
        scanf("%s", &ch);
    }
    while(ch == 'y')
        return 0;
}

Answer 1

#include<stdio.h>
int main()
{
   int a,b,c;
   char ch;

   do
   {
   printf("enter 1st and 2nd no.");
   scanf("%d%d",&a,&b);
   c = a + b;
   printf("%d",c);
   printf("Do you want to run again?");
   scanf(" %c",&ch);
   }
   while(ch == 'y');
   return 0;
   }