C Program to Calculate Sum of Odd & Even Numbers:

This is a C program to find the sum of odd and even numbers from 1 to N.

Problem Description

The program takes the number N and finds the sum of odd and even numbers from 1 to N.

Problem Solution

• Take the number N upto which we have to find the sum as input.

•  Using for loop take the elements one by one from 1 to N.

• Using if,else statements separate the element as even or odd.

• Add the even and odd numbers separately and store it in different variables.

• Print the sum separately and exit.

Program/Source Code

#include 
 
void main()
{
    int i, num, odd_sum....

This is a C program to find the sum of odd and even numbers from 1 to N.

Problem Description

The program takes the number N and finds the sum of odd and even numbers from 1 to N.

Problem Solution

• Take the number N upto which we have to find the sum as input.

•  Using for loop take the elements one by one from 1 to N.

• Using if,else statements separate the element as even or odd.

• Add the even and odd numbers separately and store it in different variables.

• Print the sum separately and exit.

Program/Source Code

#include 
 
void main()
{
    int i, num, odd_sum = 0, even_sum = 0;
 
    printf("Enter the value of num\n");
    scanf("%d", &num);
    for (i = 1; i <= num; i++)
    {
        if (i % 2 == 0)
            even_sum = even_sum + i;
        else
            odd_sum = odd_sum + i;
    }
    printf("Sum of all odd numbers  = %d\n", odd_sum);
    printf("Sum of all even numbers = %d\n", even_sum);
}

 Program Explanation

• User must first enter the number upto which he/she wants to find the sum and is stored in the variable num.

• Using for loop take the elements one by one from 1 to num.

•  Use if,else statement for each element to find whether it is odd or even by dividing the element by 2.

•  Initialize the variables odd_sum and even_sum to zero.

•  If the element is even,then increment the variable even_sum with the current element.

•  If the element is odd,then increment the variable odd_sum with the current element.

• Print the variables odd_sum and even_sum separately and exit.

Output:

Case 1:

Enter the value of num

10

Sum of all odd numbers  = 25

Sum of all even numbers = 30

 

Case 2:

Enter the value of num

100

Sum of all odd numbers  = 2500

Sum of all even numbers = 2550