C Program to display Fibonacci Numbers

Posted by AbundantCode

Problem

Write a program in C to display the sequence of Fibonacci numbers of first n numbers entered by the user.

How to display Fibonacci sequence in C Language ?

Before writing a program to display the Fibonacci sequence , it is important to understand what exactly is the Fibonacci sequence.

It is a series where the next number is the sum of the previous 2 numbers in the sequence. By default , the first two numbers are 0 and 1.

#include <stdio.h>
int main()
{
    printf("Abundantcode.com's coding sample\n");
    int number1 = 0, number2 = 1, nextnumber = 0, input;

    printf("Enter a number: ");
    scanf("%d", &input);
    printf("Fibonacci Series: %d, %d, ", number1, number2);
    nextnumber = number1 + number2;
    while(nextnumber <= input)
    {
        if(nextnumber==input)
            printf("%d",nextnumber);
        else
            printf("%d, ",nextnumber);
        number1 = number2;
        number2 = nextnumber;
        nextnumber = number1 + number2;
    }
    
    return 0;
}

Output

Abundantcode.com’s coding sample                                               
Enter a number: 5                                               
Fibonacci Series: 0, 1, 1, 2, 3, 5

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