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# How to use the ratio_not_equal() function in C++

Harsh Jain

In this shot, we learn how to use the ratio_not_equal() function.

This template alias is used to check the equality between two ratios and give the boolean value as a result. It returns true if the two ratios are not equal, or false if the two ratios are equal.

The ration_not_equal() method does this comparison between the simplest form of the two ratios.

The ratio_not_equal() function is available in the <ratio> header file in C++.

### What is a ratio?

A ratio is a representation of a fraction in which the numerator and denominator are differentiated by the colon (:) symbol.

The numerator and denominator can be of float data type.

Let’s understand with the help of some examples. Suppose we have the following ratios:

• 2 : 3
• 3 : 6

The result of the ratio_not_equal() function on comparison for equality of these two ratios gives the result as true.

Let’s explore how the equality check took place.

• The ratios 2 : 3 and 3 : 6 can be represented as $\frac{2}{3}$ and $\frac{3}{6}$​​​ in fractional form respectively.

• The ratio $\frac{2}{3}$ is itself a simplified form. The ratio $\frac{3}{6}$ on simplification gives $\frac{1}{2}$.

• Now, the simplified fractions $\frac{2}{3}$​​ and $\frac{1}{2}$ ​ are compared for equality. Since the two fractions are not equal, the final result is true.

### Parameters

The ratio_not_equal() method takes the parameters below:

• Ratio 1: A ratio object which is compared for equality with the other ratio object.
• Ratio 2: Another ratio object which is compared for equality with the previous ratio object.

### Return value

It returns a boolean result after comparison for equality.

If the ratio objects are not equal then it returns true.

If the ratio objects are equal then it returns false.

### Code

Let’s take a look at the code.

#include <iostream>
#include <ratio>
using namespace std;

int main()
{
typedef ratio<2, 3> ratio_one;
typedef ratio<3, 6> ratio_two;

if (ratio_not_equal<ratio_one, ratio_two>::value)
cout<<"The ratio_one and ratio_two are not equal";
else
cout<<"The ratio_one and ratio_two are equal";

return 0;
}

Use ratio_not_equal() function in C++

### Explanation

• In lines 1 and 2, we import the required header files.
• In line 5, we make a main() function.
• In lines 7 and 8, we declare two ratios.
• In line 10, we perform the comparison between the two declared ratios by using the ratio_not_equal() function as a condition inside the if statement. If the two ratio objects are not equal, then the if statement gets executed and displays the message regarding the result.
• In line 12, if the condition doesn’t satisfy (i.e., the two ratio objects are equal) then the statement gets executed and displays the message regarding the result.

In this way, we can use the ratio_not_equal() function to check whether the two ratios are equal.

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