关于随机生成数字的问题？？？

[xxlovec]

我想写一个随机生成1-10的数，并且输出五次，每次的数字各不相同，
就像彩票中的一样，下面是我写的程序，帮忙修改一下，谢谢了

#include <iostream>
#include <ctime>
using namespace std;
int main()
{
	int curr_data;
	size_t num=0,flag=1;
	int data[5]={-1,-1,-1,-1,-1};
	srand((unsigned)time(NULL)); 
	while(1)
	{
		curr_data=rand()%10;
		for(size_t ix=0;ix!=5;++ix)
		{
			if(curr_data==data[ix])
			{
				flag=0;
				break;
			}
		}
		if(num>4)
		{
			break;
		}
		if(flag)
		{
			data[num]=curr_data;
			cout<<data[num++]<<" ";
		}
		
	}
	cout<<"\n";
	return 0;
}

[高性能架构探索]

curr_data=rand()%10;//mark,这样只是0-9
curr_data=rand()%10 +1;才是1-10

看你的题目要生成1-10...

[Qyee]

#include <iostream>
#include <ctime>
using namespace std;
int main()
{
int curr_data;
size_t num=0;
int data[5]={-1,-1,-1,-1,-1};
srand((unsigned)time(NULL));
while(num<5)
{
curr_data=rand()%10;
for(int ix=0;ix<num;++ix)
{
if(curr_data==data[ix])
{
curr_data=rand()%10;
break;
}
}
data[num]=curr_data;
cout<<data[num++]<<" ";
}
cout<<"\n";
return 0;
}

[Qyee]

#include <iostream>
#include <ctime>
using namespace std;
int main()
{
    int curr_data;
    size_t num=0;
    int data[5]={-1,-1,-1,-1,-1};
    srand((unsigned)time(NULL)); 
    while(num<5)
    {
        curr_data=rand()%10;
        for(int ix=0;ix<num;++ix)
        {
            if(curr_data==data[ix])
            {
                curr_data=rand()%10;
                break;
            }
        }
        data[num]=curr_data;
        cout<<data[num++]<<" ";
	}
    cout<<"\n";
    return 0;
}

[Qyee]

#include <iostream>
#include <ctime>
using namespace std;
int main()
{
    int curr_data;
    size_t num=0,flag=1;
    int data[5]={-1,-1,-1,-1,-1};
    srand((unsigned)time(NULL)); 
    while(1)
    {
		flag=1;//加上
        curr_data=rand()%10;
        for(size_t ix=0;ix!=5;++ix)
        {
            if(curr_data==data[ix])
            {
                flag=0;
                break;
            }
        }
        if(num>4)
        {
            break;
        }
        if(flag)
        {
            data[num]=curr_data;
            cout<<data[num++]<<" ";
        } 
    }
    cout<<"\n";
    return 0;
}

[jackyloncoln]

3楼正解

[fangjianocean]

这几天刚好看了标准C源码（不知道是MS的还是GNU的或者别的啥公司组织的），希望对你有用。

static unsigned long int next = 1;

int rand(void)
{
next = next * 1103515245 + 12345;
return (unsigned int)(next/65536) % 32768;
}

void srand(unsigned int seed)
{
next = seed;
}