Series Display,Sum

Q. Write a C program to display the given number series and calculate sum of that series.

1  2  4  7  11  16  22 . . . . . . . . .n

Ans.

/*program to display the given series and calculating sum*/

#include<stdio.h>

#include<conio.h>

int main()

{

 int i,n;

 int sum=0,ser=1;

 printf("Enter total elements in the series:");

 scanf("%d",&n);

 for(i=1; i<=n; i++)

 {

    printf(" %d",ser);

    sum=sum+ser;

    ser=ser+i;

 }

 printf("\nSum of series = %d",sum);
 getch();

 return 0;

}

Output:-

Enter number of elements in the series : 7

 1  2  4  7  11  16  22

 Sum of series = 63