我正在尝试编写一个简单的计算程序，但答案一直回到0 [英] I am trying to write a simple calculation program but the answer keeps coming back as 0

问题描述

我花了几个小时试图弄清楚为什么这会归零，如果有人可以帮助的话，那会很棒。

I have spent a couple hours trying to figure out why this comes back as 0 If someone could help that would be great.

  1 /*Written by Connor Green*/
  2 /*CISP 1010 01/28/17*/
  3
  4 #include <iostream>
  5 using namespace std;
  6
  7 int main()
  8
  9
 10 {
 11     int carton_size, number_cartons, eggs_per_omelette, number_of_omelettes;
 12 /*This will tell you how many omelettes you can make*/
 13
 14    number_of_omelettes = carton_size * number_cartons / eggs_per_omelette;
 15    cout << "Welcome to the Egg Ordering Guide.\n";
 16    cout << "How many eggs do you want per carton? (12, 18, or 25):\n";
 17    cin >> carton_size;
 18    cout << "How many cartons?:\n";
 19    cin >> number_cartons;
 20    cout << "How many eggs in an omelette? (2 or 3):\n";
 21    cin >> eggs_per_omelette;
 22    cout << "You can make ";
 23    cout << number_of_omelettes;
 24    cout << " omelettes with this amount of eggs.\n";
 25
 26    return 0;
 27 }

推荐答案

这是因为您计算 number_of_omelettes 之前获取此计算的输入变量。将计算结果移到输出之前：

That's because you calculate number_of_omelettes before getting the input variables for this calculation. Move that calculation to just before outputting it:

...
number_of_omelettes = carton_size * number_cartons / eggs_per_omelette;
cout << "You can make " << number_of_omelettes << " omelettes with this amount of eggs.\n";

此外，请注意除法 / 运算符在乘法 * 运算符之前，由于整数除法，结果可能为零。为避免这种情况，请使用括号强制乘法运算除以：

Also, beware that the division / operator precedes the multiplication * operator, which could result in zero due to integer division. To avoid this, force the multiplication to precede the division, using parentheses:

number_of_omelettes = (carton_size * number_cartons) / eggs_per_omelette;

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