C Program to display the Fibonacci Series up-to a certain number

Before we start coding lets know what exactly Fibonacci Sequence is?
A series of a number in which each number is sum of the two preceding numbers.
For example,  1,1,2,3,5,8,13,.. is the simplest fibonacci series.

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• C Program to display the Fibonacci Series up-to  n number of terms

SOURCE CODE

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#include<stdio.h> void main() { int i, n, a=0, b=1, nxt; printf("Enter the number:\n"); scanf("%d",&amp;n); printf("The Fibonacci series is: 1, \t "); // first two term will always 1 nxt = a + b; while(nxt &lt;= n) { printf("%d, \t",nxt); a = b; b = nxt; nxt = a + b; } }

OUTPUT

Explanation

Within the main() function first we declarer i, n, a=0, b=1, nxt  as integer variable.Next we display a message for the user to give input.Then we store the value given by the user in n.Then again we display a message that  "The Fibonacci series is: 1, ".Here we have already printed the first term as 1 because we know that the first term of a Fibonacci series is always 1.Then in nxt we store the value of a+b.Then  we are running a  while loop that will run until nxt less then equall to number n.Within the loop first we are printing the value of nxt then we are assigning the value of a to b and then we are assigning the value of nxt to b and then again we are assigning the value of nxt as a+b.

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