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

By | 22.03.2017

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 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 recursive call of the function.
  • 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 : :


/* 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 ::


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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About Tunde A

My name is Tunde Ajetomobi, a Tech Enthusiast and Growth Hacker. I enjoy creating helpful content that solves problem across different topics. Codezclub is my way of helping young aspiring programmers and students to hone their skills and find solutions on fundamental programming languages.

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