有一点不好的是,randNum的取值会影响随机次序,如果randNum定了的话,无论程序运行多少遍,次序都不会变。
#include <vector>
#include <algorithm>
#include <iostream>
using namespace std;
int main()
{
vector<string> vs;
string name[] = {"徐晓寒", "韩青", "杨惠", "王忠超",
"申子欣", "张茵", "叶白璐", "王斌", "章莹婷"};
int nameSize = sizeof(name) / sizeof(string);
for(int i = 0; i < nameSize; i++)
{
vs.push_back(name[i]);
}
int vsSize = vs.size();
int randNum = 200;
for(int i = 0; i < randNum; i++)
{
random_shuffle(vs.begin(), vs.end());
}
for (int i = 0; i < vsSize; i++)
{
cout << "第 " << i + 1 << " 位 " << vs[i] << endl;
}
return 0;
}
因为以上代码固定randNum的取值,每次运行,打乱的次序不变,不过添加一行srand(unsigned(time(NULL)));
就能使得打乱次序改变了。
#include <vector>
#include <algorithm>
#include <iostream>
using namespace std;
int main()
{
srand(unsigned(time(NULL)));
vector<string> vs;
string name[] = {"徐晓寒", "韩青", "杨惠", "王忠超",
"申子欣", "张茵", "叶白璐", "王斌", "章莹婷"};
int nameSize = sizeof(name) / sizeof(string);
for(int i = 0; i < nameSize; i++)
{
vs.push_back(name[i]);
}
int vsSize = vs.size();
int randNum = 200;
for(int i = 0; i < randNum; i++)
{
random_shuffle(vs.begin(), vs.end());
}
for (int i = 0; i < vsSize; i++)
{
cout << "第 " << i + 1 << " 位 " << vs[i] << endl;
}
return 0;
}