Program for Sum of Natural Numbers

January 31, 2023

Sum of Natural Numbers

We will write a C program sum of natural numbers and the number will be entered by the user. This will help to understand the basic structure of programming. In this program , we will display the calculation of sum of natural numbers easily by using proper syntax and algorithms.

Program for Sum

Working of Program :

In the program, we will require some numbers from the user to display the calculation of sum of natural numbers.

Important Note :

  • The number which starts from one and end with infinity then that number is natural number.
  • Natural number doesn’t include zero.

Syntax of for() Loop:-

for (Initialization, condition, updation)
{
    //code
}

Problem 1

Write a program to calculate the sum of n natural number using for loop.

  • Firstly, we have to enter the number.
  • Then print the sum of natural numbers.

Code

Run 
#include<stdio.h>
int main ()
{
  int n = 5, i, sum = 0;
  for (i = 1; i <= n; ++i)
    {
      sum += i;
    }
  printf ("Sum of natural number = %d", sum);
  return 0;
}

Output

Sum of natural number = 15
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Note:

In the following program we will display the calculation of sum of natural number using while() loop.

Syntax for while() Loop:-

while(condition)
{
    // Statements
    // Increment / Decrement
}

Problem 2

Write a program to calculate the sum of n natural number using while loop.

  • Firstly, we have to enter the number.
  • Then print the sum of natural numbers.

Code

Run 
#include<stdio.h>
int main ()
{
  int n = 6, i, sum = 0;
  i = 1;
  while (i <= n)
    {
      sum += i;
      ++i;
    }
  printf ("Sum of natural numbers = %d", sum);
  return 0;
}

Output

Sum of natural numbers = 21
C tutorial desk gif

Syntax for do-while() Loop:-

do
{
    // Statements
    // Increment / Decrement
}
while(condition)

Problem 3

Write a program to calculate the sum of n natural number using do-while loop.

  • Firstly, we have to enter the number.
  • Then print the sum of natural numbers.

Code

Run 
#include<stdio.h>
int main ()
{
  int n = 4, i, sum = 0;
  i = 1;
  do
    {
      sum += i;
      ++i;
    }
  while (i <= n);
  printf ("Sum of natural numbers = %d", sum);
  return 0;
}

Output

Sum of natural numbers = 10

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