Answer:
int main() {
int num;
cout<<"Enter the number"<<endl;
cin>>num;
if(num<1 || num>20)
{
while(num>20 || num<1)//taking input if the number is not within range..
{
cout<<"Enter the number again"<<endl;
cin>>num;
}
activity(num);//calling activity with the num..
}
return 0;
}
Explanation:
Above written is the main function in which a prompting an integer between 1 and 20 if it is not within range then again taking input.Then after that calling activity with num as argument.
