Write a java program implementing do-while to print the first n numbers of a Fibonacci Series.
Answers
Answer: n this program, you'll learn to display fibonacci series in Java using for and while loops. You'll learn to display the series upto a specific term or a number.
To understand this example, you should have the knowledge of the following Java programming topics:
Java for Loop
Java while and do...while Loop
The Fibonacci series is a series where the next term is the sum of the previous two terms. The first two terms of the Fibonacci sequence are 0 followed by 1. The Fibonacci sequence: 0, 1, 1, 2, 3, 5, 8, 13, 21, ...
public class Fibonacci {
public static void main(String[] args) {
Example 1
int n = 10, t1 = 0, t2 = 1;
System.out.print("First " + n + " terms: ");
for (int i = 1; i <= n; ++i)
{
System.out.print(t1 + " + ");
int sum = t1 + t2;
t1 = t2;
t2 = sum;
}
}
}
Output
0 + 1 + 1 + 2 + 3 + 5 + 8 + 13 + 21 + 34 +
In the above program, first (t1) and second (t2) terms are initialized to the first two terms of the Fibonacci series 0 and 1 respectively.
Then, for loop iterates to n (number of terms) displaying the sum of the previous two terms stored in variable t1.
Example 2
public class Fibonacci {
public static void main(String[] args) {
int i = 1, n = 10, t1 = 0, t2 = 1;
System.out.print("First " + n + " terms: ");
while (i <= n)
{
System.out.print(t1 + " + ");
int sum = t1 + t2;
t1 = t2;
t2 = sum;
i++;
}
}
}
he output is the same as the above program.
In the above program, unlike a for loop, we have to increment the value of i inside the body of the loop.
Though both programs are technically correct, it is better to use for loop in this case. It's because the number of iteration (from 1 to n) is known.