switch语句的运用
#include <cstdio>
#include <cstring>
#include <string>
#include <cmath>
#include <iostream>
#include <algorithm>
#include <vector>
#include <stack>
#include <queue>
#include <stdlib.h>
#include <sstream>
#include <map>
#include <set>
typedef long long ll;
using namespace std;
int ar[10005];
int main()
{
int n, m, sum;
char c;
scanf("%d%c%d",&n,&c,&m);
switch (c)
{
case '+': printf("%d",n+m);break;//记得每一句后面都要break
case '-': printf("%d",n-m);break;
case '*': printf("%d",n*m);break;
case '/': printf("%d",n/m);break;
}
return 0;
}