*1397简单算术表达式求值

Posted 2020-10-16 TFLSNOI

 1 #include<iostream>
 2 #include<cstdio>
 3 #include<cstring>
 4 char a[20];
 5 using namespace std;
 6 int js(int x,int y,char f)
 7 {
 8     switch(f)
 9     {
10         case ‘+‘:cout<<x+y;break;
11         case ‘-‘:cout<<x-y;break;
12         case ‘*‘:cout<<x*y;break;
13         case ‘/‘:cout<<x/y;break;
14         case ‘%‘:cout<<x%y;break;
15     }
16     
17 } 
18 int main()
19 {
20     gets(a);
21     int len=strlen(a);
22     int b[5],j=0,x,y;
23     char f;
24     for(int i=0;i<len;i++)
25     {
26         if(a[i]>=‘0‘&&a[i]<=‘9‘)b[j++]=a[i]-‘0‘;
27         else if (a[i]!=‘ ‘)f=a[i];
28     }
29     x=b[0]*10+b[1];
30     y=b[2]*10+b[3];
31     js(x,y,f);
32     return 0;
33 }