求大神告知这串代码如何修改，谢谢啦（C语言初学者

Aiaoming @ 2024-12-19 13:47:23

#include<stdio.h>
#include<string.h>
int calculate(int a,int b,char op)
{
    switch (op)
    {
        case'a':
        return a+b;
        case'b':
        return a-b;
        case'c':
        return a*b;
        default:
        return 0;
    }
}
int main()
{
  int n;
  scanf("%d",&n);
  char op;
  int num1,num2;
  for(int i=0;i<n;i++)
  {

      scanf("%c %d %d",&op,&num1,&num2);
      int result=calculate(num1,num2,op);
      char equation[100];
      sprintf(equation,"%d%c%d=%d",num1,op,num2,result);
      printf("%s\n",result);
      printf("%d\n",(int)strlen(equation));
  }
  return 0;

}    

by EXR_FAL @ 2024-12-19 14:41:53

@Aiaoming
三个问题：

1. 读入不能直接scanf()不然又读字符又读整数scanf会炸掉scanf()，这样写：

   char line[100];
   fgets(line,sizeof(line),stdin);
   sscanf(line,"%c %d %d",&op,&num1,&num2);

   2.op是读的'a' 'b' 'c'但题目要的是'+' '-' '*',所以加一个函数trans()转换：

   char trans(char c){
   switch (c)
   {
       case'a':
       return '+';
       case'b':
       return '-';
       case'c':
       return '*';
       default:
       return 0;
   }
   } 

   3.printf("%s\n",result);是认真的吗，result是个整数。。。 改成printf("%s\n",equation);
   完整代码：

   
   #include<stdio.h>
   #include<string.h>
   int calculate(int a,int b,char op)
   {
   switch (op)
   {
       case'a':
       return a+b;
       case'b':
       return a-b;
       case'c':
       return a*b;
       default:
       return 0;
   }
   }
   char trans(char c){
   switch (c)
   {
       case'a':
       return '+';
       case'b':
       return '-';
       case'c':
       return '*';
       default:
       return 0;
   }
   }
   int main()
   {
   int n;
   scanf("%d",&n);getchar();
   char op;
   int num1,num2;
   for(int i=0;i<n;i++)
   {
     char line[100];
     fgets(line,sizeof(line),stdin);
     sscanf(line,"%c %d %d",&op,&num1,&num2);
     int result=calculate(num1,num2,op);
     char equation[100];
     sprintf(equation,"%d%c%d=%d",num1,trans(op),num2,result);
     printf("%s\n",equation);
     printf("%d\n",strlen(equation));
   }
   return 0;

}

by Aiaoming @ 2024-12-19 20:29:35

@zhexueder妈呀，太强了大神，谢谢谢~~