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01-Core-Java/08-Java-Programs/042-Prime-Number.java at main · shaikbasha-dev/01-Core-Java · GitHub
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08-Java-Programs
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042-Prime-Number.java
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08-Java-Programs
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042-Prime-Number.java
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/*
* ============================================================================
* Program Name : Prime Number
* File Name : 042-Prime-Number.java
* Class Name : PrimeNumber
*
* Description:
* This program accepts an integer from the user and checks whether
* the given number is a Prime Number or not using the for loop.
*
* Objective:
* - Understand user input using the Scanner class.
* - Learn how to find the factors of a number.
* - Determine whether a number is prime.
*
* Author : Shaik Mahaboob Basha
* Repository : 01-Core-Java
* Folder : 08-Java-Programs
* ============================================================================
*/
import
java
.
util
.
Scanner
;
public
class
PrimeNumber
{
// The main() method is the entry point of every Java application.
public
static
void
main
(
String
[]
args
) {
// Create a Scanner object to read input from the keyboard.
Scanner
scanner
=
new
Scanner
(
System
.
in
);
// Ask the user to enter a number.
System
.
out
.
print
(
"Enter a Number: "
);
// Read the number entered by the user.
int
number
=
scanner
.
nextInt
();
// Declare and initialize a variable to count the factors.
int
factorCount
=
0
;
// Check whether the entered number is valid.
if
(
number
<=
1
) {
// Display that the number is not prime.
System
.
out
.
println
(
number
+
" is Not a Prime Number."
);
// Example Output:
// 1 is Not a Prime Number.
}
else
{
// Find the factors of the given number.
for
(
int
i
=
1
;
i
<=
number
;
i
++) {
// Check whether the current number is a factor.
if
(
number
%
i
==
0
) {
// Increase the factor count.
factorCount
++;
}
}
// Check whether the number has exactly two factors.
if
(
factorCount
==
2
) {
// Display that the number is a Prime Number.
System
.
out
.
println
(
number
+
" is a Prime Number."
);
// Example Output:
// 13 is a Prime Number.
}
else
{
// Display that the number is not a Prime Number.
System
.
out
.
println
(
number
+
" is Not a Prime Number."
);
// Example Output:
// 12 is Not a Prime Number.
}
}
// Close the Scanner object to release system resources.
scanner
.
close
();
}
}
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