Question

我有一个基本问题，希望有人可以帮助我。我非常有信心这是一个小型，健忘的问题，缺少回报或类似的东西。

///////////////////////////
//My Basic Calculator App
//Written by l8nit3tr0ubl3
//of NottaDev inc.
///////////////////////////

#include <iostream>

void in() //Take input from user, all 3 variables.
{
    int add(int, int); //Forward declarations
    int minus(int, int);
    int divide(int, int);
    int multiply(int, int);//end declarations

    std::cout << "My Basic Calculator\n";//take inputs
    std::cout << "Please input your first number.\n";
    int firstNumber;
    std::cin >> firstNumber;
    std::cout << "Choose math function.\n";
    std::cout << "Eg. *-+/\n";
    char operatorType;
    std::cin >> operatorType;
    std::cout << "Please input second number.\n";
    int secondNumber;
    std::cin >> secondNumber;//end inputs

    if (operatorType == '+') //determine math function to use
        add(firstNumber, secondNumber);
    else if (operatorType == '-')
        minus(firstNumber, secondNumber);
    else if (operatorType == '/')
        divide(firstNumber, secondNumber);
    else if (operatorType == '*')
        multiply(firstNumber, secondNumber);//end math function
}

int add(int firstNumber, int secondNumber) //Actual math is done
{
    return firstNumber  + secondNumber;
}
int minus(int firstNumber, int secondNumber)
{
    return firstNumber  - secondNumber;
}
int divide(int firstNumber, int secondNumber)
{
    return firstNumber  / secondNumber;
}
int multiply(int firstNumber, int secondNumber)
{
    return firstNumber  * secondNumber; //End math
}

int main()
{
    in(); //Call input, which will call math function
    return 0; //return '0' for no error.
}

有人可以告诉我忘记打电话或退回吗？

我应该对我的问题更加准确，并且我为没有这样做而道歉。没有产生错误，我根本无法回应我对控制台的回答。但是，下面提供了一个完美的答案

Answer 1

您的add，multiply等函数会返回操作结果，但您没有对其执行任何操作。

你可以打印它：

std::cout << add(firstNumber, secondNumber) << std::endl;

Answer 2

您可能希望输出计算结果。所以写

result = add(firstNumber, secondNumber);

但更好的是，如果你只输出一次。为此使用一个temprary变量，例如

std::cout << "The result is " << result << std:endl;

...

import time, resource, os

import boto

conn = boto.connect_s3()
for i in range(20):
  print resource.getrusage(resource.RUSAGE_SELF).ru_maxrss
  path = 'test.png'
  bucket = conn.lookup('jca-screenshots-' + ('thumbs' if i % 2 == 0 else 'normal'))
  k = boto.s3.key.Key(bucket)
  k.key = os.path.basename(path)
  k.set_contents_from_filename(path)
  time.sleep(5)

Answer 3

你的add，multiply和minus函数在（）中返回void，并且在返回它们时没有为它们分配变量。

c ++新手，在函数calc.cpp之后没有返回值

3 个答案: