In this C program, we will learn how to write a program to calculate the sum of Odd and Even numbers.

Here is the code of the program to calculate the sum of Odd and Even numbers.

```
/*
C Program to Calculate the Sum of Odd & Even Numbers
*/
#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 between 1 to %d = %d\n",num, odd_sum);
printf("Sum of all even numbers between 1 to %d = %d\n",num, even_sum);
}
```

Enter the value of num

25

Sum of all odd numbers between 1 to 25 = 169

Sum of all even numbers between 1 to 25 = 156

--------------------------------

Process exited after 4.037 seconds with return value 46

Press any key to continue . . .

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