C Exercises: Display the first n terms of Fibonacci series

Last update on December 20 2024 13:17:08 (UTC/GMT +8 hours)

Write a program in C to display the first n terms of the Fibonacci series.
The series is as follows:
Fibonacci series 0 1 2 3 5 8 13 .....

The program should prompt the user for the number of terms, n, and then calculate the Fibonacci sequence up to that number. The Fibonacci series starts with 0 and 1, and each subsequent term is the sum of the previous two terms. The resulting series should be printed to the screen.

Visual Presentation:

Display the first n terms of Fibonacci series

Sample Solution:

C Code:

#include <stdio.h> // Include the standard input/output header file.

void main()
{
   int prv=0, pre=1, trm, i, n; // Declare variables for previous, current, and next terms, as well as loop counters.

   printf("Input number of terms to display : "); // Prompt the user to input the number of terms.
   scanf("%d", &n); // Read the input from the user.

   printf("Here is the Fibonacci series up to %d terms : \n", n); // Print a message indicating the number of terms.

   printf("% 5d % 5d", prv, pre); // Print the first two terms.

   for(i=3; i<=n; i++) // Loop to generate the Fibonacci series starting from the third term.
   {
     trm = prv + pre; // Calculate the next term.
     printf("% 5d", trm); // Print the next term.
     prv = pre; // Update the previous term.
     pre = trm; // Update the current term.
   }

   printf("\n"); // Move to the next line after printing the series.
}

Output:

Input number of terms to  display : 10                                                                        
Here is the Fibonacci series upto  to 10 terms :                                                              
    0     1    1    2    3    5    8   13   21   34

Flowchart:

C Programming Code Editor:

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