write a program to check number is prime or not in computer
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C Program to Check Whether a Number is Prime or Not
Example to check whether an integer (entered by the user) is a prime number or not using for loop and if...else statement.
Prime Numbers
To understand this example, you should have the knowledge of following C programming topics:
C if...else Statement
C for Loop
C break and continue
A prime number is a positive integer which is divisible only by 1 and itself. For example: 2, 3, 5, 7, 11, 13
Example: Program to Check Prime Number
#include <stdio.h>
int main()
{
int n, i, flag = 0;
printf("Enter a positive integer: ");
scanf("%d", &n);
for(i = 2; i <= n/2; ++i)
{
// condition for nonprime number
if(n%i == 0)
{
flag = 1;
break;
}
}
if (n == 1)
{
printf("1 is neither a prime nor a composite number.");
}
else
{
if (flag == 0)
printf("%d is a prime number.", n);
else
printf("%d is not a prime number.", n);
}
return 0;
}
Answer:
import java.util.*;
class Prime_no
{
public static void main()
{
Scanner sc=new Scanner(System.in);
System.out.println("Enter number of elements to be entered");
int n=sc.nextInt();
int a[]=new int[n];
int f;
System.out.println("Enter "+n+" elements");
for(int i=0;i<n;i++)
a[i]=sc.nextInt();
System.out.println("Prime numbers:");
for(int i=0;i<n;i++)
{
f=0;
for(int j=1;j<=a[i];j++)
{
if(a[i]%j==0)
f++;
}
if(f==2)
System.out.println(a[i]);
}
}
}