C Program: Print first 10 Fibonacci numbers - While loop

C While Loop: Exercise-10 with Solution

Write a C program to find and print the first 10 Fibonacci numbers using a while loop.

Sample Solution:

C Code:

#include <stdio.h>

int main() {
    int count = 10;          // Number of Fibonacci numbers to generate
    int firstTerm = 0, secondTerm = 1;  // Initialize the first two terms of the sequence

    printf("First %d Fibonacci numbers:\n", count);

    // Start a while loop to generate Fibonacci numbers
    while (count > 0) {
        printf("%d, ", firstTerm);  // Print the current Fibonacci number
        int nextTerm = firstTerm + secondTerm;  // Calculate the next Fibonacci number
        firstTerm = secondTerm;  // Update the first term with the value of the second term
        secondTerm = nextTerm;   // Update the second term with the calculated next term
        count--;  // Decrease the count for the next iteration

    return 0;  // Indicate successful program execution

Sample Output:

First 10 Fibonacci numbers:
0, 1, 1, 2, 3, 5, 8, 13, 21, 34,


Here are key parts of the above code step by step:

  • Variable initialization:
    • count: Number of Fibonacci numbers to generate (set to 10).
    • firstTerm and secondTerm: Initialize the first two terms of the Fibonacci sequence.
  • Print Statement:
    • Prints a message indicating the intent to display the first 10 Fibonacci numbers.
  • While Loop (Fibonacci Generation):
    • Enters a while loop that continues until 'count' becomes 0.
    • Prints the current Fibonacci number ('firstTerm').
    • Calculates the next Fibonacci number ('nextTerm') by adding the first and second terms.
    • Updates the first and second terms for the next iteration.
    • Decreases the count for the next iteration.
  • Return Statement:
    • Indicates successful program execution.


Flowchart: Print first 10 Fibonacci numbers - While loop.

C Programming Code Editor:

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