This C Program calculates the sum of odd & even numbers. The program first seperates odd and even numbers. Later it adds the odd and even numbers seperately.

Here is source code of the C program to calculate the sum of odd & even numbers. The C program is successfully compiled and run on a Linux system. The program output is also shown below.

`/*`

`* C program to find the sum of odd and even numbers from 1 to N`

`*/`

`#include <stdio.h>`

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);

`}`

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$ cc pgm12.c $ a.out Enter the value of num 10 Sum of all odd numbers = 25 Sum of all even numbers = 30 $ a.out Enter the value of num 100 Sum of all odd numbers = 2500 Sum of all even numbers = 2550

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