## Add, Subtract, Multiply and Division in C Programming Language

Write a program in C Programming to perform basic arithmetic operation like addition, subtraction, multiplication and division. C Programming Language comes with arithmetic operators. Operator we will use in the C Program are:

• ‘-‘ Subtraction
• ‘*’ Multiplication
• ‘/’ Division

This operation can be performed on Integer, Float or Double Number. These are Data Types.

```/**
Write a C program to perform arithmetic Operation on two Numbers
**/
#include <stdio.h>

int main()
{
int first, second, add, subtract, multiply;
float divide;

printf("Enter two integers\n");
scanf("%d%d", &first, &second);

subtract = first - second;
multiply = first * second;
divide     = first / (float)second;   //typecasting

printf("Difference = %d\n",subtract);
printf("Multiplication = %d\n",multiply);
printf("Division = %.2f\n",divide);

return 0;
}```

Output:

```Enter Two Integers
5 4
Sum = 9
Difference = 1
Multiplication = 20
Division = 1.25```

In c language when we divide two integers we get integer result for example 5/2 evaluates to 2. As a general rule integer/integer = integer and float/integer = float or integer/float = float. So we convert denominator to float in our program, you may also write float in numerator. This explicit conversion is known as typecasting.

## Check Odd or Even Number using C Programming Language

Today I will show How can we check a number is odd or even in C Programming Language. We also use different method to identify even and odd numbers.

As we all know if we divide any number by 2 and the remainder is 0 (zero), then that number is Even, Otherwise its odd. We will use same logic here in C Programming. In C Programming we can get remainder by % (Modulus) operator.

For example of modulus operator, 3%2 gives 1 as remainder. Even numbers are in form of (2*x) and Odd numbers are in form of ((2*x)+1). Here ‘x’ is integer number.

## Program 1: Check whether number is even or odd using modulus operator

```#include<stdio.h>

main()
{
int n;

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

if ( n%2 == 0 )
printf("Even\n");
else
printf("Odd\n");

return 0;
}```

We can also check the whether the number is even or odd using bitwise operator & (AND).

For example, Binary of 9 is 1001. When we perform 9 & 1, The result will be 1 and you may observe that the least significant bit of every odd number is 1, so ( odd_number & 1 ) will be always one and also ( even_number & 1 ) is zero.

## Program 2: Check whether number is even or odd using Bitwise operator

```#include<stdio.h>

main()
{
int n;

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

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

return 0;
}```

## Program 3: Check whether number is even or odd using Conditional Operator (Without using ‘if’ Conditional Operator)

```#include<stdio.h>

main()
{
int n;

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

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

return 0;
}```

In C Programming Language when we divide two integers we get an integer result.

For example the result of 7/3 will be 2. We can take advantage of this and can 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.

## Program 4: Check whether number is even or odd without using Modulus or Bitwise Operator

```#include<stdio.h>

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;
}```