Write a c++ program to check whether a given number is prime or not?

Answer 1

Best Answer - Chosen by Voters

Hi,try this one...

#include<iostream.h>
int main()
{
int num;
cout << "Enter a number ";
cin >> num;
int i=2;
while(i<=num-1)
{
if(num%i==0)
{
cout << "\n" << num << " is not a prime number.";
break;
}
i++;
}
if(i==num)
cout << "\n" << num << " is a prime number.";
return 0;
}

Answer 2

The program for prime number is as follow.........

#include<iostream.h>
#include<conio.h>

main()
{
int a,c=0,i,n;
printf("enter the number to be checked");
scanf("%d",&n);
for(i=1;i<=n;i++)
{
a=n%i;
if(a=0)
{
c=c+1;
}
}
if (c=2)
{ printf("the given number is prime"); }
else
printf("the given number is not prime");

getch();
}

Answer 3

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