Question

7. Write a recursive method (sum) that uses the following formula to find the sum Your answer:

Answer 1

Source Code:

#include<stdio.h>
int sum(int);
int main()
{
   int n,result;       //variable declaration
   printf("\nEnter the value of N: ");
   scanf("%d",&n);       //takes input
   result=sum(n);       //call recursive function
   printf("sum of 1 to %d is %d\n",n,result);       //print result
   return 0;
}
//Resursive function
int sum(int n)
{
   /* In every recursive call value of n is decremented by 1
       and when the value of n becomes 1 it returns 1 */
   if(n==1)  
   {
       return 1;
   }
   else
   {
       return n+sum(n-1);
   }
}

Output:

-/Desktop/Chegg/sum.c - Sublime Text (UNREGISTERED) File Edit Selection Find View Goto Tools Project Preferences Help sum.c o vouw #include<stdio.h> int sum(int); int main() devil@devil-X555LF:-/Desktop/Chegg File Edit View Search Terminal Help int n, result; //variable declarat devil@devil-X555LF:-/Desktop/Chegg$ gcc sum.c printf("\nEnter the value of N: "); devil@devil-X555LF:-/Desktop/Chegg$ ./a.out scanf("%d",&n); //takes input resultasum(n); // call recursive Enter the value of N: 10 printf("sum of 1 to ed is d\n", n, resul sum of 1 to 10 is 55 return ; devil@devil-X555LF:-/Desktop/Chegg$ 13 //Resursive function int sum(int n) /* In every recursive call value of ni and when the value of n becomes 1 i if(n==1) return 1; else return n+sum(n-1); Line 12, Column 14 Tab Size: 4 C % 100% 00:42