tong.cpp

examples C,c++ codes programs

#include<iostream.h>
#include<conio.h>
#include<iomanip.h>
#include<math.h>
int ktsnt( int n)
{
int i;
for(i=2;i<(sqrt(n)+1);i++)
if(n%i==0) return 0;
return 1;
}
void main()
{
int n;
cout<<"kiem tra so nguyen to"<<endl;
do
{
cout<<"\nnhap n = ";
cin>>n;
}
while (n<2||n>100);


if (ktsnt(n)==0)
cout<<n <<" khong la so nguyen to";
else cout<<n <<" la so nguyen to";
getch();
}