加减乘除

doubleresult =0; Console.Write("请选择一种运算：1、加法 2、减法 3、乘法 4、除 法"+"\n"); Console.Write("请选择算法：");doublea = Convert.ToInt32(Console.ReadLine ()); Console.WriteLine("请输入第一个数字：");doubleb = Convert.ToInt32(Console.ReadLine()); Console.WriteLine("请输入第二个数字：");doublec = Convert.ToInt32(Console .ReadLine ());if(a==1) { result = b + c; }if(a==2) {if(c>b) {doubletemp =0; temp = c; c = b; b = temp; } result = b- c; }if(a==3) { result = b * c; }if(a==4) {if(c>b) {doublet =0; t = c; c = b; b = t; } result = b / c; } Console.WriteLine(); Console.WriteLine("*********运算结果是：{0}",result); Console.ReadKey();