C program to generate the first n terms of Fibonacci sequence

In this article we will learn to implement a C program to generate the first n terms of Fibonacci sequence. A C program is provided below which reads a number and prints the Fibonacci sequence up to n.

Program is as follows:

//C program to generate the first n terms of a Fibonacci sequence
#include<stdio.h>
#include<conio.h>
void main()
{
	int n, a, b, c, i;
	printf("Enter a +ve integer: ");
	scanf("%d",&n);
	if(n==1)
		printf("Fibonacci series: 0");
	else if(n==2)
		printf("Fibonacci series: 0 1");
	else if(n>2)
	{
		printf("Fibonacci series: 0 1 ");
		a=0;
		b=1;
		i=3;
		while(i<=n)
		{
			c=a+b;
			a=b;
			b=c;
			printf("%d ",c);
			i++;
		}
	}
	else
		printf("Invalid number!");
	getch();
}

Input and output of the above program is as follows:

Enter a +ve integer: 10
Fibonacci series: 0 1 1 2 3 5 8 13 21 34

Suryateja Pericherla

Suryateja Pericherla, at present is a Research Scholar (full-time Ph.D.) in the Dept. of Computer Science & Systems Engineering at Andhra University, Visakhapatnam. Previously worked as an Associate Professor in the Dept. of CSE at Vishnu Institute of Technology, India.

He has 11+ years of teaching experience and is an individual researcher whose research interests are Cloud Computing, Internet of Things, Computer Security, Network Security and Blockchain.

He is a member of professional societies like IEEE, ACM, CSI and ISCA. He published several research papers which are indexed by SCIE, WoS, Scopus, Springer and others.