# C++ Program to Check Odd Number

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## What are Odd Numbers?

An integer (never a fraction) that cannot be divided exactly by 2. For example, 3 is an odd number, i.e., 3 % 2 = 1 (not zero).

Note: % is a Modulus (Division Remainder) operator, it finds the remainder after division of one number by another. Please check our Arithmetic Operators for more details.

Tips: It is recommended to use our online Odd Numbers calculator for better understanding.

## Using For Loop

In the following example, we will find all the Odd Numbers between 10 and 25 using for loop.

### Example

C++ Compiler
#include <iostream> using namespace std; int main() { int start = 10; int end = 25; cout << "Odd numbers between " << start << " and " << end << ":\n"; for(start=start; start<=end; start++) { if(start % 2 != 0) cout << start << " "; } return 0; }

### Output

Odd numbers between 10 and 25: 11 13 15 17 19 21 23 25

## Using While Loop

In the following example, we will find all the Odd Numbers between 10 and 25 using while loop.

### Example

C++ Compiler
#include <iostream> using namespace std; int main() { int start = 10; int end = 25; cout << "Odd numbers between " << start << " and " << end << ":\n"; while(start <= end) { if(start % 2 != 0) cout << start << " "; start++; } return 0; }

### Output

Odd numbers between 10 and 25: 11 13 15 17 19 21 23 25

## Using do while Loop

In the following example, we will find all the Odd Numbers between 10 and 25 using do while loop.

### Example

C++ Compiler
#include <iostream> using namespace std; int main() { int start = 10; int end = 25; cout << "Odd numbers between " << start << " and " << end << ":\n"; do{ if(start % 2 != 0) cout << start << " "; start++; }while(start <= end); return 0; }

### Output

Odd numbers between 10 and 25: 11 13 15 17 19 21 23 25

## Odd Numbers between any Given Range

In the following example, we will find all the Odd numbers between any given range.

### Example

C++ Compiler
#include <iostream> using namespace std; int main() { int start, end; cout << "Enter a (int) starting number: "; cin >> start; cout << "Enter an (int) ending number: "; cin >> end; cout << "\nOdd numbers between " << start <<" and " << end <<":\n"; for(start=start; start<=end; start++) { if(start % 2 != 0) cout << start << " "; } return 0; }

### Output

Enter a (int) starting number: 5 Enter an (int) ending number: 11 Odd numbers between 5 and 11: 5 7 9 11

## Check Whether the Given Number is Odd or Even

In the following example, we will check whether the given number is an Odd number or Even number.

### Example

C++ Compiler
#include <iostream> using namespace std; int main() { int num; cout << "Enter a (int) number: "; cin >> num; if(num % 2 == 0) cout << num << " is an even number"; else cout << num << " is an odd number"; return 0; }

### Output

Enter a (int) number: 65 65 is an odd number

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