Qt创建不重复随机数

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该代码创建一个随机数的类。

构造函数有两个：（1）参数为一个整形数，如传入300，则产生0~299的随机数，其中随机数不重复。（2）参数为Qlist<int>，根据这个list直接初始化。

//头文件

#ifndef RAND_NUM

#define RAND_NUM

#include <QList>

class RandNum

    public:

        RandNum(int nimg);

        RandNum(QList<int> ilist);

        ~RandNum();

        int  getRandNum(int x);

        void showRandNum(void) const;

        int  getImgNum(void);

protected:

 private:

        QList<int> intList;

        int  nImg;

};

#endif // RAND_NUM

//.cpp文件

#include <QDebug>

#include <QApplication>

#include "mainwindow.h"

#include <QTime>

#include <rand_num.h>

RandNum::RandNum(int nimg)

    this->nImg=nimg;

    int   i=0, m=0;

    QTime time;

    for(i=0;;)

        int     randn;

        time    = QTime::currentTime();

        qsrand(time.msec()*qrand()*qrand()*qrand()*qrand()*qrand()*qrand());

        randn   = qrand()%nImg;

        m=0;

        while(m<i && intList.at(m)!=randn) m++;

        if(m==i)            { intList.append(randn); i++;}

        else if(i==nImg)    break;

        else                continue;

RandNum::RandNum(QList<int> ilist)

    this->nImg = intList.count();

    this->intList = ilist;

RandNum::~RandNum(){}

int  RandNum::getRandNum(int x)

    if (x>=intList.count()){

        qDebug()<<"exceed intList count!"<<"x:"<<x<<";count:"<<intList.count();

        return -1;

    }else{

        return this->intList.at(x);

 void RandNum::showRandNum() const

    qDebug()<<"=====randNumber show begin========";

    qDebug()<<"intList.count():"<<intList.count();

    for(int i=0; i<this->intList.count(); i++) {

        qDebug()<<i<< this->intList.at(i);

    qDebug()<<"=====randNumber show end==========\n";

int  RandNum::getImgNum()       { return intList.count(); }

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