C++遇到难题不会了，基础题，求指导

#include<iostream>
#include<cstdlib>
#include<ctime>
using namespace std;
int main()
{
int num;
int guess;
int diff;
bool isGuessed;
srand(time(0));
num = rand() % 100;
isGuessed = false;
while (!isGuessed)
{
cout << ” Enter an integer greater”
<< ” than or equal to 0 and”
<< ” less than 100 : “;
cin >> guess;
cout << endl;
if (guess == num)
{
cout << ” You guessed the correct ”
<< ” number. ” << endl;
isGuessed = true;
}
else if (guess < num)
cout << ” Your guess is lower than the ”
<< ” number.\n Guess again!”
<< endl;
else
cout << ” Your guess is higher than”
<< ” the number.\n Guess again!”
<< endl;
}
return 0;
}
这是原题，然后老师让我们改说是加个 diff , （diff 是一个 int variable）让diff = （Num -guess）的绝对值，假如diff = 0 然后猜测是对的。

解决方案

160

#include<iostream>
#include<cstdlib>
#include<ctime>
using namespace std;
 
 
int main()
{
    int num;
 
    int guess;
 
    int diff;
 
    bool isGuessed;
 
    srand(time(0));
    num = rand() % 100;
    isGuessed = false;
    cout << num;
 
    while (!isGuessed)
    {
        cout << " Enter an integer greater"
            << " than or equal to 0 and"
            << " less than 100 : ";
 
        cin >> guess;
        diff = abs(num - guess);
        if (diff == 0)
        {
            cout << " You guessed the correct "
                << " number. " << endl;
            isGuessed = true;
        }
        else
            cout << " Your guess wrong"
            << " the number.\n Guess again!"
            << endl;
 
    }
    return 0;
}