C Program to Calculate Sum of All Odd Numbers Between 1 to N using For Loop

In this C program, we will calculate the sum of all odd numbers between 1 to 100 using for loop.

Required Knowledge

• C printf and scanf functions
• For loop in C

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C program to find sum of all odd numbers between 1 to N using for loop

#include <stdio.h>  
  
int main() {  
    int counter, N, sum = 0;  

    printf("Enter a Positive Number\n");
    scanf("%d", &N);
  
    for(counter = 1; counter <= N; counter++) {  
        /* Odd numbers are not divisible by 2 */  
        if(counter%2 == 1) { 
            /* counter is odd, add it to sum */
            sum = sum + counter;  
        }  
    }
    printf("Sum of Odd numbers from 1 to %d is %d", N, sum);

    return 0;  
} 

Output

Enter a Positive Number
9
Sum of Odd numbers from 1 to 9 is 25

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