1+11+111+1111+....c

/*

    1+11+111+1111+....c

    https://web.facebook.com/photo/?fbid=2725046141108551&set=gm.1443761712477398

    https://www.w3resource.com/c-programming-exercises/for-loop/c-for-loop-exercises-26.php
    https://www.geeksforgeeks.org/find-sum-series-1111111111-upto-n-terms/
    https://www.codesansar.com/c-programming-examples/sum-of-1-11-111-1111-up-to-n-terms-using-recursive-function.htm

    You can find all my C programs at Dragan Milicev's pastebin:

    https://pastebin.com/u/dmilicev

*/

#include <stdio.h>

int main(void)
{
    int n,i;                // n is the number of terms
    long sum=0;             // total sum
    long int addition=1;    // addition is term

    printf("\n Input the number of terms n = ");
    scanf("%d",&n);
    printf("\n");

    for(i=1; i<=n; i++)
    {
        printf(" %ld ", addition);

        if (i<n)
          printf("+");
        else
          printf("=");

        sum = sum + addition;
        addition = addition*10 + 1;
    }

    printf(" %ld \n", sum);

    return 0;
}