I recently bought "C++ Without Fear by Brian Overland". I just worked through a program example called NIM. It worked correctly. Another example he wanted us to work on was only allowing a positive integer to be used for the starting total. I entered the
snippet of code from the example downloads I have but whenever I run it and enter the starting total as -1 it will still work. It is supposed to say "Please enter a positive integer only". Here is the code for the entire program. Can someone tell me what I
did incorrectly? I am still VERY new to C++ but I want to learn it to change my life. Someone please look over my code and help me. Thanks.
Randy
#include
<iostream>
using
namespace
std;
int
main() {
int
total, n;
cout <<
"Welcome to NIM. Pick a starting total: ";
cin >> total;
while
(total < 1) {
cout <<
"Please pick positive integer only.";
cout <<
"Pick starting total: ";
cin >> total;
}
while
(true)
{
// Pick best response and print results
if
((total % 3) == 2) {
total = total -2;
cout <<
"I am subtracting 2."
<< endl;
}
else
{
total--;
cout <<
"I am subtracting 1."
<< endl;
}
cout <<
"New total is "
<< total << endl;
if
(total == 0) {
cout <<
"I win!"
<< endl;
break;
}
// Get users response; must be 1 or 2
cout <<
"Enter number to subtract (1 or 2): ";
cin >> n;
while
(n < 1 || n > 2) {
cout <<
"Input must be 1 or 2."
<< endl;
cout <<
"Re-enter: ";
cin >> n;
}
total = total -n;
cout <<
"New total is "
<< total << endl;
if
(total == 0) {
cout <<
"You win!"
<< endl;
break;
}
}
system(
"PAUSE");
return
0;
}
