C#-练习题

1、输入两个数，将两个数交换后输出

 1 using system;
 2 
 3 namespace exchangetwonumbers
 4 {
 5     class exchangetwonumbers
 6     {
 7         static void main(string[] args)
 8         {
 9             console.writeline("enter two integers and end with the enter key");
10             console.write("please input a：");
11             int a = convert.toint32(console.readline());
12             console.write("please input b：");
13             int b = convert.toint32(console.readline());
14 
15             a = a - b;
16             b = a + b;
17             a = b - a;
18 
19             console.writeline("a is：{0}", a);
20             console.writeline("b is：{0}", b);
21             console.readkey();
22         }
23     }
24 }

结果