Write a c program to print fibonacci series using do while loop?

Answer 1

#include<iostream>

using namespace std;

#define MIN 1

#define MAX 1000000

int main()

{

int num;

char c;

do

{

cout << "Enter a number from " << MIN << "-" << MAX << " (0 to quit): ";

cin >> num;

while(cin.fail() num < 0 num > MAX)

{

if( cin.fail() )

{

cin.clear();

cin >> c;

}

cout << "Invalid number, try again: ";

cin >> num;

}

if(num)

{

cout << "\nFibbonacci series for n, where 1 <= n <= " << num << ":\n\n";

int n = 1, x = 0, y = 0;

do

{

cout << n;

x = y;

y = n;

n = x + y;

if( n < num )

cout << ", ";

}while( n < num );

cout << endl << endl;

}

}while( num );

return( 0 );

}

Answer 2

Before jumping to program we will look how Fibonacci series are generated.

Fibonacci series is linear sequence of integers, there first one is 0 and second one is 1. Now all other elements are generated using this rule: Fn+1 = Fn + Fn-1.

0 1 1 2 3 5 8 13 21 34 55 89 ...

...

34 = 21 + 13

55 = 34 + 21

89 = 55 + 34

...

Here is small program that does the same and it uses do-while loop:

#include

int main() {

int num = 0;

int a = 0, b = 1;

int count = 0;

printf("How many numbers you want? (3 mininmum) ");

scanf("%d", &num);

printf("0 1 ");

do {

b = a + b;

a = b - a;

b = a + b - a;

printf("%d ", b);

count++;

} while (count <= num - 3);

printf("\n");

return 0;

}

Testing:

How many numbers you want? (3 mininmum) 20

0 1 1 2 3 5 8 13 21 34 55 89 144 233 377 610 987 1597 2584 4181

Answer 3

Yes....Here is the code....

#include <stdio.h>

public int main() {

int num1 = 0;

int num2 = 0;

int num3;

int maxlimit;

printf("Enter the maximum limit of Fibonacci series : ");

scanf(%d",&maxlimit);

printf("%d\t", num1,num2);

num3 = num1 + num2;

if (maxlimit > 0) {

while ( num3 < maxlimit) {

printf("%d",num3);

num3 = num1 + num2;

num1 = num2;

num2 = num3;

}

}

else

printf("Invalid limit !");

}

Answer 4

public class fib{

public static void main(String[] args){

int count=0;

int i=0;

int j=1;

do{

System.out.println(j+" ");

int k= i+j;

i=j;

j=k;

}

while (++count<15);

}