C program to find sum of seris in A.P - My CS Tutorial

In this tutorial we will learn how to write a program to find sum of series in A.P.

We will enter first two numbers for finding common difference and the last term of series.

C program code

#include<stdio.h>

#include<conio.h>

void main()

{

  int a,n,sum=0,num1,num2,diff,lastnum,series;

  printf("\n Enter first 2 numbers for finding common Difference:\n ");

  scanf("%d%d",&num1,&num2);

  printf("\n Enter last term of series:\n ");

  scanf("%d",&lastnum);

  diff=num2-num1;

  series=num1;

  n=((lastnum-num1)/diff)+1;

  printf("\n Number of terms in series is %d\n ",n);

  for(a=1;a<=n;a++)

  {

   sum+=series;

   series+=diff;

  }

  series=num1;

  printf("\n Sum of the series:\n ");

    for(a=1;a<=n;a++)

  {

     if(a<n)

     {

      printf("%d+",series);

      series+=diff;

     }

     else

     {

      printf("%d=%d\n",series,sum);

      series+=diff;

     }

  }

  getch();

}

OUTPUT:

In this output the value of first two numbers for finding common difference is 1 and 4

And the last term of series is 48

The series is:

1+4+7+10+13+16+19+22+25+28+31+34+37+40+43+46

Numbers of terms in this series is 16

Sum of this series is :-  376

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Created by-- HARSH CHAUHAN