sum1toN.c

#include <stdio.h>
#include <stdlib.h>

// Write a function that can calculate the summation from 1 to n positive number where n is passed as parameter.

// we need function sum()

int sum(int n) {
    int sum1toN = 0;
    for(int i = 0; i < n; i++) {
        sum1toN += i;  // sum1toN = sum1toN + i;
    }
    return sum1toN;
}


int main() {

// we need to ask user to input value of n

int n;

printf("Enter value of n: ");
scanf("%d", &n);
// we need to print the result from sum() function

printf("the summation from 1 to %d is : %d  ", n, sum(n));

}