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Exercise: Compute the Fibonacci Number

Write code to solve the problem.

Question

Write a function that computes the nthn^{th} Fibonacci number.

  • The function should be called fib and should take as input a single integer value in a variable n. It should return an integer value representing the nthn^{th} Fibonacci number.
  • The function should use a loop instead of recursion.

Sample input:

fib(4)

Sample output:

3
Similar Problems
Argument Checking
Variable Scope
Automatic vs. Static Variables
Inline Functions
Variadic Functions
Exercise: Is the Number Prime
Exercise: Get nth Prime Number
Quiz on Functions
Defining a Function
Input Arguments
Home
Courses
Learn C Fundamentals

Exercise: Compute the Fibonacci Number

Write code to solve the problem.

Question

Write a function that computes the nthn^{th} Fibonacci number.

  • The function should be called fib and should take as input a single integer value in a variable n. It should return an integer value representing the nthn^{th} Fibonacci number.
  • The function should use a loop instead of recursion.

Sample input:

fib(4)

Sample output:

3
Similar Problems
Argument Checking
Variable Scope
Automatic vs. Static Variables
Inline Functions
Variadic Functions
Exercise: Is the Number Prime
Exercise: Get nth Prime Number
Quiz on Functions
Defining a Function
Input Arguments
C
#include <stdio.h>
int fib(int n)
{
  // Write your code here...
  return 0;
}
int main(void)
{
    int n = 10;
    printf("Fibonacci number at position %d is %d\n", n, fib(n));
    return 0;
}