请各位帮忙，把程序修改小一点，原意不变~~~~~谢谢~~~~
main()
{
 int i;
 printf("+input'1' -input'2' *input'3' /input'4'");
 scanf("%d",&i);
 if(i==1)
  {
   int a,b,c;
   scanf("%d,%d",&a,&b);
   c=a+b;
   printf("=%d\n",c);
  }
   else
  if(i==2)
       {
 int a,b,c;
 scanf("%d,%d",&a,&b);
 c=a-b;
 printf("=%d\n",c);
 }
  else
       if(i==3)
      {
       int a,b,c;
       scanf("%d,%d",&a,&b);
       c=a*b;
       printf("=%d\n",c);
      }
       else
     if(i==4)
    {
     int a,b,c;
     scanf("%d,%d",&a,&b);
     c=a/b;
     printf("=%d\n",c);
    }
     else
   if(i<1||i>=4)
         printf("Please input afresh 1-4 of number!\n");
}

谢谢大家,原来可以用"switch"来选择的呀,我明白了,以后我会向各位多多学习~~~~~~