C Exercises: Calculate the sum of numbers from 1 to n
C Recursion : Exercise-2 with Solution
Write a program in C to calculate the sum of numbers from 1 to n using recursion.
Pictorial Presentation:
Sample Solution:
C Code:
#include<stdio.h>
int sumOfRange(int);
int main()
{
int n1;
int sum;
printf("\n\n Recursion : calculate the sum of numbers from 1 to n :\n");
printf("-----------------------------------------------------------\n");
printf(" Input the last number of the range starting from 1 : ");
scanf("%d", &n1);
sum = sumOfRange(n1);
printf("\n The sum of numbers from 1 to %d : %d\n\n", n1, sum);
return (0);
}
int sumOfRange(int n1)
{
int res;
if (n1 == 1)
{
return (1);
} else
{
res = n1 + sumOfRange(n1 - 1); //calling the function sumOfRange itself
}
return (res);
}
Sample Output:
Recursion : calculate the sum of numbers from 1 to n : ----------------------------------------------------------- Input the last number of the range starting from 1 : 5 The sum of numbers from 1 to 5 : 15
Flowchart:
C Programming Code Editor:
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C Programming: Tips of the Day
Static variable inside of a function in C
The scope of variable is where the variable name can be seen. Here, x is visible only inside function foo().
The lifetime of a variable is the period over which it exists. If x were defined without the keyword static, the lifetime would be from the entry into foo() to the return from foo(); so it would be re-initialized to 5 on every call.
The keyword static acts to extend the lifetime of a variable to the lifetime of the programme; e.g. initialization occurs once and once only and then the variable retains its value - whatever it has come to be - over all future calls to foo().
Ref : https://bit.ly/3fOq7XP
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