C++ | Finding prime numbers from array

Introduction

This is program to find the prime numbers form the array list. The program is given below. The program is not extendable. Go enjoy the program. Lets begin…….

Program to find prime number from array list.

#include<iostream.h>
#include<conio.h>
void main()
{
//clear the screen.
clrscr();
//declare variable type int
int a[10],i,j,f,m;
//Input the two numbers save them in arrays.
//Here for loop is used to input multiple numbers in array.
for(i=0;i<5;i++)
{
cout<<“Enter the no.”<<endl;
cin>>a[i];
}
//Draw a line for good looking program.
cout<<“————————————“<<endl;
cout<<“Prime numbers are “<<endl;
//Print the array.
for(i=0;i<5;i++)
{
f=0;
for(j=2;j<a[i];j++)
{
m=a[i]%j;
if(m==0)
{
f=1;
break;
}
}
if(f==0)
cout<<a[i]<<endl;
}
//get character
getch();
}

Output

Enter the number
2
Enter the number
3
Enter the number
4
Enter the number
5
Enter the number
6
————————————
Prime numbers are
2
3
5

How does it work

  1. You enter the number.
  2. The number is saved in respective array.
  3. The numbers from arrays are taken and tested if prime number.
  4. The prime numbers are printed.

Extending it

The program cannot be extended.

Explanation.

  1. Include ‘iostream.h’ and ‘conio.h’ files.
  2. Add void main.
  3. Start program by first clearing the screen.
  4. Declare the variables as int (name them as you want.)
  5. Add the cout and cin of array.
  6. Add for loop to find prime number.
  7. Print the prime number.

At the end

You learnt creating the C++ program of Finding prime numbers from array. So now enjoy the program.

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