C program to find sum of n numbers - My CS Tutorial

In this tutorial we will learn how to write a program that find and print the sum of N numbers.

Explanation:

1. First we initialized i,n, and sum which is declared as zero.
2. A number is given by user (say 5).
3. Now the logic is:sum=sum+i
   • sum=0+0=0
   • for next iteration i becomes '1' sosum=0+1=1
   • for next iteration i becomes '2' sosum=2+1=3
   • for next iteration i becomes '3' sosum=3+3=6
   • for next iteration i becomes '4' sosum=4+6=10
   • for next iteration i becomes '5' sosum=10+5=15
   • for next iteration i becomes '6' which is not less than or equal to 'n'(i.e 5 as we took a value for explanation) then the loop terminates and goes to the next line.
4. Then the value of sum which is '15' will be printed.

C program code

#include<stdio.h>

#include<conio.h>

main()

{

  int i,n,sum=0;

  printf("\n Enter a number\n ");

  scanf("%d",&n);

  for(i=0;i<=n;i++)

  {

    sum=sum+i;

    printf("\n %d",i);

  }

  printf("\n Sum is=%d\n",sum);

  getch();

}

OUTPUT 1:

OUTPUT 2:

In first output,the value of input number is 5
After calculation
The value of sum is 15

In second output,the value of input number is 8
After calculation
The value of sum is 36


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Created by-- HARSH CHAUHAN