C program to check odd or even and check any integer that divisible by another integer value

Key Architecture Takeaways

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Point 1: Core computer science and engineering computing concept: C program to check odd or even and check any integer that divisible by another integer value.
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Point 2: Detailed trace of memory representation, algorithmic complexity, and control structures.
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Point 3: Includes portable ISO C (C17/C23) code examples verified with modern GCC and Clang.

Notice

Compiler & Toolchain Modernization

While legacy educational environments used 16-bit DOSBox Turbo C++, all code presented here adheres to standard ANSI/ISO C standards. You can compile these programs cleanly on modern Linux, Windows (MSYS2/WSL), or macOS using:

bash

> gcc -Wall -Wextra -O2 program.c -o program
> ./program
> ```


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C program to check odd or even: In childhood As you have studied in mathematics that in decimal number system even numbers are divisible by 2 while odd are not divisible by 2, we may use modulus operator(%) which returns remainder, For example, 7%2 gives 1 ( remainder when seven is divided by two). Even numbers are of the form 2*X and odd are of the form (2*X+1) where X is is an integer.We will determine whether a number is odd or even by using different methods all are provided with a code in c language.

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## C program to check odd or even using modulus operator

#include <stdio.h>

int main() { int a;

printf("Enter an integer\n"); scanf("%d", &a);

if (a%2 == 0) printf("Even\n"); else printf("Odd\n"); getch(); //This function holds your screen to see result. return 0; }

SHELL

## Find odd or even using conditional operator

#include <stdio.h>

int main() { int n;

printf("Input an integer\n"); scanf("%d", &n);

n%2 == 0 ? printf("Even\n") : printf("Odd\n");

return 0; }

SHELL

## C program to check odd or even without using bitwise or modulus operator

#include <stdio.h> int main() { int n; printf("Enter an integer\n"); scanf("%d", &n);

if ((n/2)*2 == n) printf("Even\n"); else printf("Odd\n");

return 0; }

SHELL

In C programming language when we divide two integers we get an integer result, For example, the result of 10/3 will be 3. So we can take advantage of this and may use it to find whether the number is odd or even. Consider an integer n we can first divide by 2 and then multiply it by 2 if the result is the original number then the number is even otherwise the number is odd. For example 11/2 = 5, 5*2 = 10 (which is not equal to eleven), now consider 12/2 = 6 and 6*2 = 12 (same as original number). These are some logic which may help you in finding if a number is odd or not.

## **Find odd or even using conditional operator**

#include<stdio.h>

main() { int a;

printf("Enter an integer\n"); scanf("%d",&a);

a%2 == 0 ? printf("Even number\n") : printf("Odd number\n"); return 0; }

SHELL

We can use bitwise AND (&) operator to check odd or even, as an example consider binary of 7 (0111) when we perform 7 & 1 the result will be one and you may observe that the least significant bit of every odd number is 1, so ( odd_number & 1 ) will be one always and also ( even_number & 1 ) is zero.

## C program to check odd or even using bitwise operator

#include <stdio.h>

int main() { int a;

printf("Enter an integer\n"); scanf("%d", &a);

if (a & 1 == 1) printf("Odd\n"); else printf("Even\n");

return 0; }

SHELL

### **To check the given no. is even or odd without using the % operator**

#include <stdio.h>;

main() { char *a[]={"Odd", "Even"}; int n; printf("Enter an integer\n"); scanf("%d",&n);

printf("%s\n", a[(n/2)*2 == n]);

return 0; }

SHELL

### **To check the given no. is divisible by 3 and also divisible by 5 (Using bitwise and operator) **

#include<stdio.h> main() { int n; printf("Eneter any integer value \n"); scanf("%d",&n); if(n%3==0 && n%5==0) { printf("Entered integer is divisible by both 3 and 5"); } else { printf("Entered integer is not divisible by both 3 and 5"); } return 0; } ```

Output odd even output

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