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#include <stdio.h>
#include <math.h>
bool isPrime(int number)
{
int i;
int k;
k=(int)sqrt((double)number);
for(i = 2; i <= k; i++)
if(number%i==0) break;
if(i>k)
return true;
else
return false;
}
int main(int argc, char* argv[])
{
int number = 0;
printf("Please enter an integer:\n");
scanf("%d", &number);
if(isPrime(number))
{
printf("%d is a prime.\n", number);
}
else
{
printf("%d is not a prime.\n", number);
}
}
#include <iostream>
using namespace std;
void swaptwo(int &a,int &b)
{
int t=a;
a=b;
b=t;
}
int main()
{
for (int i=1;i<100;i++)
{
int counter=0;
for (int j=2;j<i;j++)
{
if ((i%j)==0)
counter++;
}
if (counter==0)
cout << i << endl;
}
return 0;
}