using system;
using system.collections.generic;
using system.linq;
using system.text;
using system.threading.tasks;
namespace consoleapplication3
{
class program
{
static void main(string[] args)
{
console.writeline("第一个数：");
int a = convert.toint32(console.readline());
console.writeline("输入运算符（+—*/）");
// c=console.readline();
char str=convert.tochar(console.readline());
console.writeline("第er个数：");
int b = int32.parse(console.readline());
//int c = a + b;
//console.writeline("两个数和为：{0}",c);
switch (str) {
case ‘+‘:
console.writeline("两个数和为：{0}", a+b);
break;
case ‘-‘:
console.writeline("两个数差为：{0}", a-b);
break;
case ‘*‘:
console.writeline("两个数积为：{0}", a*b);
break;
case ‘/‘:
console.writeline("两个数商为：{0}", a/b);
break;
case ‘%‘:
console.writeline("两个数余数为：{0}", a % b);
break;
default:
console.writeline("输入正确的运算符！！");
break;
}
}
}
