Write a program in C to display the sum of the series [ 9 + 99 + 999 + 9999 ...].

QUESTION:- Write a program in C to display the sum of the series [ 9 + 99 + 999 + 9999 ...]. 

Test Data : 

Input the number or terms :5 

Expected Output : 

9 99 999 9999 99999    

The sum of the series = 111105 

program

  

#include <stdio.h>

#include <conio.h>

int main()

{

    int no, i, sum = 0, t = 9;

    printf("Enter a number: ");

    scanf("%d", &no);

    for (i = 0; i <= no; i++)

    {

        sum += t; // sum = sum + t;

        printf("%d ", t);

        t = t * 10 + 9; // 9*10+9 = 99

    }

    printf("\nThe sum is %d ", sum);

    return 0;

    getch();

}

OUTPUT

Enter a number: 

5

9 99 999 9999 99999 999999 

The sum is 1111104

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