Question



Robot::Robot()

fitness = 5;
totalBattery = 5;

int randNum;

int i = 0;
bool valid = true;

srand(time(NULL));

//get robot's position on board and check to see if it is not starting on the wall
while (valid)
{
    position = (rand()+i++) % 196;

    if (position >= 0 && position <= 14)
    { }
    else if ((position % 14) == 0 || (position % 14) == 13)
    { }
    else if (position >= 183 && position <= 195)
    { }
    else 
    {
        valid = false;
        cout << endl << "MY POSITION IS : " << position << endl << endl;    
    }
}

//randomize Robot Genetics
for (int j = 0; j < genes; j++)
{
    for (int k = 0; k < chromosomes; k++)
    {
        //first 4; set N S E W(what the robot looks for in that direction)
        //0 = empty; 1 = battery; 2 = don't care; 3 = wall
        if (k < 4)
        {
          randNum = ((rand()+i++) % 4);
            switch(randNum)
            {
                //Empty Space
                case 0: 
                    DNA[j][k] = " * ";
                    break;

                //Battery
                case 1:
                    DNA[j][k] = " B ";
                    break;

                //Don't Care
                case 2:
                    DNA[j][k] = " D ";
                    break;

                //Wall
                case 3:
                    DNA[j][k] = " W ";
                    break;

                default:
                    cout << "YOUR CODE SCREWED UP IF YOU ARE IN HERE!! " << endl;
            }
        }
        //direction facing; N S E W
        else if (k < 5)
        {
            randNum = ((rand()+i++) % 4);
            switch(randNum)
            {
                case 0: 
                    DNA[j][k] = "N";
                    break;

                case 1:
                    DNA[j][k] = "S";
                    break;

                case 2:
                    DNA[j][k] = "E";
                    break;

                case 3:
                    DNA[j][k] = "W";
                    break;

                default:
                    cout << "YOUR CODE SCREWED UP IF YOU ARE IN HERE!! " << endl;
                    break;

            }
        }
        //step counter in that direction
        else if (k < 6)
        {
            DNA[j][k] = "0";
        }
        //Rotate Right(R); Rotate Left(L); Move in facing Direction(M); Do Nothing (X)
        else
        {
            randNum = ((rand()+i++) % 4);
            switch(randNum)
            {
                case 0: 
                    DNA[j][k] = "X";
                    break;

                case 1:
                    DNA[j][k] = "L";
                    break;

                case 2:
                    DNA[j][k] = "R";
                    break;

                case 3:
                    DNA[j][k] = "M";
                    break;

                default:
                    cout << "YOUR CODE SCREWED UP IF YOU ARE IN HERE!! " << endl;
                    break;

            }
        }
    }   
}

}

我正在尝试构建一个类的对象，我需要200个它们。我正在使用一个向量并迭代一个while循环，每次我构造一个新的类实例时，对象都会输出完全相同的数据。在构造类的对象时，如何正确使用随机函数函数将不同的数据转换为变量？我尝试做研究，但它让我到了这一点，我不确定为什么这不起作用。先谢谢你。

Answer 1

很可能你生产的物体太快了。如果time()方法在每次调用构造函数时产生相同的值，则会产生相同的“随机”值。

如果您在程序启动srand上只调用rand()一次，则会为每个对象生成不同的值。

C ++使用构造函数随机化不同的变量

1 个答案: