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Youbar

C++ % Operator Problem

6 posts in this topic

Hi, I'm just starting out C++ and decided to have an attempt at making a calculator, probably very crude but it works. Anyway, I'm having a problem with the % operator. This is only a portion of my code, but you'll get the gist:

[CODE]else if(response == 5) {
cout << "Remainder" << endl;
cout << "Enter first number: ";
cin >> fn;
cout << "Enter second number to divide and get remainder: ";
cin >> sn;
float ovrl = (fn % sn);
cout << ovrl << endl;
system("PAUSE");
goto startagain;
}[/CODE]

The code returns this error:
invalid operands of types `float' and `float' to binary `operator%'

Full code here:[spoiler][CODE]
#include <iostream>
using namespace std;
float fn = 0;
float sn = 0;
float response = 0;
int yn = 0;
int main() {
main:
system("CLS");
cout << "1. Division" << endl << "2. Multiplication" << endl << "3. Addition" << endl << "4. Subtraction" << endl << "5. Remainders" << endl;
cin >> response;
system("CLS");
if(response == 1) {
cout << "Divison" << endl;
cout << "Enter first number: ";
cin >> fn;
cout << "Enter second number to divide: ";
cin >> sn;
float ovrl = (fn / sn);
cout << ovrl << endl;
system("PAUSE");
goto startagain;
}

else if(response == 2) {
cout << "Multiplication" << endl;
cout << "Enter first number: ";
cin >> fn;
cout << "Enter second number to multiply: ";
cin >> sn;
float ovrl = (fn * sn);
cout << ovrl << endl;
system("PAUSE");
goto startagain;
}

else if(response == 3) {
cout << "Addition" << endl;
cout << "Enter first number: ";
cin >> fn;
cout << "Enter second number to add: ";
cin >> sn;
float ovrl = (fn + sn);
cout << ovrl << endl;
system("PAUSE");
goto startagain;
}

else if(response == 4) {
cout << "Subtraction" << endl;
cout << "Enter first number: ";
cin >> fn;
cout << "Enter second number to subtract: ";
cin >> sn;
float ovrl = (fn - sn);
cout << ovrl << endl;
system("PAUSE");
goto startagain;
}

else if(response == 5) {
cout << "Remainder" << endl;
cout << "Enter first number: ";
cin >> fn;
cout << "Enter second number to divide and get remainder: ";
cin >> sn;
float ovrl = (fn % sn);
cout << ovrl << endl;
system("PAUSE");
goto startagain;
}

else {
goto main;
}

startagain:
system("CLS");
cout << "Would you like to start again? (1 = Y / 2 = N)";
cin >> yn;
if(yn == 1) {
goto main;
}

else if(yn == 2) {
exit(0);
return 0;
}

else {
exit(0);
}
}
[/CODE]
[/spoiler]
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I believe the modulus operator (%) only works with integer types. You'll have to convert fn and sn to integer if you want to use it.

Or...a quick search on google and I stumbled upon "fmod". Used like so:
[CODE]
fmod(5.5, 3.5) // takes numerator and denominator
[/CODE]
Note: I've never used this function before, so no promises. Though I believe you need to include the math header file to use fmod.
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I don't understand the fmod function...but about the converting fn and sn to integers...wouldn't that remove the decimals and round it down?
e.g 1.2 % 5 would return 0. Edited by Youbar
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fmod is simply a floating point version of the modulus operator. It takes two arguments (the numerator and denominator, in that order) and calculates the remainder like so:
remainder = numerator - quotient * denominator where quotient is an integer and the remainder is less than the denominator.
For example fmod(5.5,3.5) would return 2.
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Could you give me an example of how I would apply it to my script please? It's returning errors.[img]http://public.gamedev.net//public/style_emoticons/default/unsure.png[/img]
Thanks. [img]http://public.gamedev.net//public/style_emoticons/default/smile.png[/img]
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Thanks, problem solved. [img]http://public.gamedev.net//public/style_emoticons/default/laugh.png[/img]
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