C Exercises: Display the sum of the series [ 9 + 99 + 999 + 9999 ...]

C For Loop: Exercise-21 with Solution

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

Pictorial Presentation:

Sample Solution:

C Code:

#include <stdio.h>

void main()
{   long int n,i,t=9;
	int sum =0;
	printf("Input the number or terms :");
	scanf("%ld",&n);
	for (i=1;i<=n;i++)
	{ sum +=t;
	  printf("%ld   ",t);
	  t=t*10+9;
	}
	printf("\nThe sum of the series = %d \n",sum);
} 

Sample Output:

Input the number or terms :5                                                                                  
9   99   999   9999   99999                                                                                   
The sum of the series = 111105  

Flowchart:

C Programming Code Editor:

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