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public abstract class calculator { public double number1 { get; set; } public double number2 { get; set; } public abstract double calculate(); }
class add : calculator { public add(double n1,double n2) { this.number1 = n1; this.number2 = n2; } public override double calculate() { return number1 + number2; } }
class sub : calculator { public sub(double n1,double n2 ) { this.number1 = n1; this.number2 = n2; } public override double calculate() { return number1 - number2; } }
class program { static void main(string[] args) { console.writeline("第一个数"); double number1 = convert.todouble(console.readline()); console.writeline("操作符"); string operate= console.readline(); console.writeline("第二个数"); double number2= convert.todouble(console.readline()); calculator calculator = null; switch (operate) { case "+": calculator = new add(number1, number2); break; case "-": calculator = new sub(number1, number2); break; } if (calculator!=null) { console.writeline("结果是:{0}",calculator.calculate()); } else { console.writeline("没有这种操作"); } } }
优化:
calculator calculator = getcomputeobject(operate, number1, number2);
private static calculator getcomputeobject(string perate, double number1, double number2) { calculator result = null; switch (perate) { case "+": result = new add(number1, number2); break; case "-": result = new sub(number1, number2); break; } return result; }
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