**C Program to display numbers from 1 to n and their sum by recursion**

**C Program to display numbers from 1 to n and their sum by recursion**

Write a C Program to display numbers from 1 to n and their sum. How to find sum of natural numbers in a given range in C programming. C program to find sum of natural numbers in given range. Logic to find sum of all natural numbers in a given range in C program.

**Recursion : :**

**Recursion : :**

- Recursion is the process of repeating items in a self-similar way. In programming languages, if a program allows you to call a function inside the same function, then it is called a
of the function.**recursive call**

- The C programming language supports recursion, i.e., a function to call itself. But while using recursion, programmers need to be careful to define an exit condition from the function, otherwise it will go into an infinite loop.

- Recursive functions are very useful to solve many mathematical problems, such as calculating the factorial of a number, generating Fibonacci series, etc.

Below is the source code for C Program to display numbers from 1 to n and their sum by recursion which is successfully compiled and run on Windows System to produce desired output as shown below :

**SOURCE CODE : :**

**SOURCE CODE : :**

/* Program to display numbers from 1 to n and their sum*/ #include<stdio.h> int summation(int n); void display1(int n); void display2(int n); int main( ) { int n; printf("Enter number of terms : "); scanf("%d", &n); display1(n); printf("\n"); display2(n); printf("\n"); printf("sum = %d\n", summation(n)); return 0; } /*End of main()*/ int summation( int n) { if(n==0) return 0; return ( n + summation(n-1) ); }/*End of summation()*/ /*displays in reverse order*/ void display1(int n) { if( n==0 ) return; printf("%d ",n); display1(n-1); }/*End of display1()*/ void display2(int n) { if( n==0 ) return; display2(n-1); printf("%d ",n); }/*End of display2()*/

**OUTPUT : :**

**OUTPUT : :**

//OUTPUT :: Enter number of terms : 15 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 sum = 120 Process returned 0

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