04_Practice_3.c

#include<stdio.h>

int main(){
    int n, sum=0;

    printf("Enter a Number:\n");
    scanf("%d\n",&n);

    for(int i=1; i<=n; ++i){
        sum+=i;
    }
    printf("sum of first %d natural number is %d\n",n,sum);
    return 0;
}