我知道随机并不是真正随机的,因此实现了随时间变化的 srand
,但是它并不是在我每次运行程序时都给出随机值,而是完全相同的值 92 和 98,或者更确切地说是 2 和 8。我想要我的变量 int randValPlayer = rand() % 20 + 1;
和 int randValCPU = rand() % 20 + 1;
给随机值。
我将 srand(time(0));
放在我的主要函数中。我尝试更改预期值的随机算法。
class Game
{
private:
int playerHealth = 100;
int cpuHealth = 100;
int userChoice;
int randValPlayer = rand() % 20 + 1;
int randValCPU = rand() % 20 + 1;
public:
int attackPlayer()
{
playerHealth = playerHealth - randValPlayer;
return playerHealth;
}
int attackCPU()
{
cpuHealth = cpuHealth - randValCPU;
return cpuHealth;
}
void choice()
{
cout << "Input '1' to attack CPU" << endl;
cin >> userChoice;
if (userChoice == 1)
{
attackCPU();
cout << "CPU's health reduced to " << cpuHealth << endl;
attackPlayer();
cout << "Player health reduced to " << playerHealth << endl;
system("pause");
}
}
}gameobj;
class Foundation
{
private:
int userChoice;
public:
void startProgram()
{
cout << "Please input desired number: " << endl;
cout << "1. Calculator" << endl;
cout << "2. Equation calculator" << endl;
cout << "3. Game" << endl;
cin >> userChoice;
system("cls");
if (userChoice == 1) {
calcobj.calcOperation();
}
if (userChoice == 2) {
equationobj.equationChoice();
}
if (userChoice == 3) {
gameobj.choice();
}
}
}foundobj;
int main()
{
foundobj.startProgram();
srand(time(0));
return 0;
} ```
I expected the output to be random but the integer values are just the exact same, via 8 and 2.
最佳答案
您忘了考虑时间 - 您需要在使用生成器之前为生成器播种,但您将其作为程序中的最后一件事来执行。
即使您先在 main
中移动 srand
,此程序也不会运行,因为您的全局 Game
实例是在此之前创建的。
由于(可变的)全局变量通常不是一个好主意,所以这是重写的好机会。
我建议这样:
class Game
{
// ...
};
class Foundation
{
private:
Game gameobj;
// The other objects here...
public:
void startProgram()
{
int userChoice = 0;
cin >> userChoice;
// ...
if (userChoice == 3) {
gameobj.choice();
}
}
};
int main()
{
srand(time(0));
Foundation foundobj;
foundobj.startProgram();
return 0;
}
关于c++ - 我的 RNG 值确定意外值,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/56900451/