第1个回答 2013-05-04
public class Calculator {
public double add(double num1, double num2){
return num1 + num2;
}
public double minus(double num1, double num2){
return num1 - num2;
}
public double multiple(double num1, double num2){
return num1 * num2;
}
public double divide(double num1, double num2){
if(num2 != 0){
return num1/num2;
}
return -1;//除数为0,错误
}
}