Write a C program to calculate the

There are multiple approaches to solve this problem.

* We can solve this problem using loop.

* Other approach is to use mathematical formula to calculate the sum of first n natural number.

* We can also use recursion to find the sum of first n natural numbers using recursion.

Suppose if user has entered a

Program to Calculate Sum of Digits of a Number

1. First approach is to use for loop to calculate the sum of first n natural numbers.

Program to Count Number of Words in a Sentence by Taking Input from User

2. Another approach is to use mathematical formula

Suppose, If user has entered the value of n is 20 = 20 * (20 + 1)/2 = 210

The sum of first 20 numbers is 210.

C, C++ Interview Questions.

We have discussed multiple approaches to calculate the sum of first n natural numbers. Let's write a code to solve this problem using discussed approaches.

In this approach, we are calculating the sum of first n natural numbers using mathematical formula.

Find the Sum of First N Odd Numbers

The sum of n number is : 55

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**sum of first n natural numbers**. Given an input n, We have to write a code to print the sum of first n natural number (1 to n).There are multiple approaches to solve this problem.

* We can solve this problem using loop.

* Other approach is to use mathematical formula to calculate the sum of first n natural number.

* We can also use recursion to find the sum of first n natural numbers using recursion.

Suppose if user has entered a

**number 10**. So, we have to calculate the sum of first 10 numbers ( 1 to 10). The Sum of first 10 numbers is 55.Program to Calculate Sum of Digits of a Number

### How to Calculate the Sum of first N Natural Numbers

1. First approach is to use for loop to calculate the sum of first n natural numbers.

for(i=1; i<=num; i++){ sum +=i; }

Program to Count Number of Words in a Sentence by Taking Input from User

2. Another approach is to use mathematical formula

**n(n+1)/2**to calculate the sum of first n natural numbers.Suppose, If user has entered the value of n is 20 = 20 * (20 + 1)/2 = 210

The sum of first 20 numbers is 210.

C, C++ Interview Questions.

## C Program to Calculate the Sum of First n Natural Numbers using Mathematical Formula

We have discussed multiple approaches to calculate the sum of first n natural numbers. Let's write a code to solve this problem using discussed approaches.

In this approach, we are calculating the sum of first n natural numbers using mathematical formula.

#include <stdio.h> int main() { int n,sum; printf("Enter the value of n"); scanf("%d",&n); sum = (n*(n+1))/2; printf("The sum of n number is %d",sum); return 0; }

## C Program to Calculate Sum of First n Natural Numbers using For Loop

#include <stdio.h> int main(void) { int n,sum=0,i; printf("Enter the value of n"); scanf("%d",&n); /* Iterate from 1 to n . */ for(i=1; i<=n; i++) { sum = sum + i; } printf("The sum of n number is %d",sum); return 0; }

Find the Sum of First N Odd Numbers

**Output:****Enter the value of n : 10**

The sum of n number is : 55

Programming questions on Strings

Programming questions on Recursion

Programming questions on Array

Programming questions on Linked List

very nicely explained!!

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