VC++运行结果不对

[渤海红鱼]

这是一个c++的一段程序。我把他写到VC++上的时候发现不能正常的运行了。请大家帮我解决一下。
#include "stdafx.h"
#include "iostream.h"
#include "stdlib.h"

void main(void)
{
int i;
for (i=0;i<10;i++);
cout <<rand()%100<<" ";
cout<<endl<<endl;

srand (2);
for (i=0;i<10;i++);
cout <<rand()%100<<" ";
cout<<endl<<endl;

srand (1);
for (i=0;i<10;i++);
cout <<rand()%100<<" ";
cout<<endl;
}

[macfan]

#include <iostream>
using namespace std; 
int main( ) 
{ 
int i; 
for (i=0;i <10;i++); 
cout < <rand()%100 < <" "; 
cout < <endl < <endl; 

srand (2); 
for (i=0;i <10;i++); 
cout < <rand()%100 < <" "; 
cout < <endl < <endl; 

srand (1); 
for (i=0;i <10;i++); 
cout < <rand()%100 < <" "; 
cout < <endl; 
return 0;
}

[sc_valentine21]

建一个应用程序

#include "stdafx.h" 
#include "iostream.h" 
#include "stdlib.h" 
==
==
==
#include <iostream>
using namespace std;

[zhaohongbo83]

#include <iostream>
using namespace std;
int main( )
{
int i;
for (i=0;i <10;i++);
cout < <rand()%100 < <" ";
cout < <endl < <endl;

srand (2);
for (i=0;i <10;i++);
cout < <rand()%100 < <" ";
cout < <endl < <endl;

srand (1);
for (i=0;i <10;i++);
cout < <rand()%100 < <" ";
cout < <endl;
return 0;
}

这个运行一下
41


45


41

这个函数的作用是什么？这个随机数是怎么回事？

[zhaohongbo83]

明白了！

[wolfdog1111]

是呀，为什么随机数每次都一样？不要srand还是每次的值都一样？

[wolfdog1111]

[Quote=引用 8 楼 zhaohongbo83 的回复:]
明白了！
[/Quote]

楼上的怎么回事，给讲下！

[yang1670414]

[Quote=引用 7 楼 zhaohongbo83 的回复:]
#include <iostream>
using namespace std;
int main( )
{
int i;
for (i=0;i <10;i++); 分号不要
cout < <rand()%100 < <" ";
cout < <endl < <endl;

srand (2);
for (i=0;i <10;i++); 分号不要
cout < <rand()%100 < <" ";
cout < <endl < <endl;

srand (1);
for (i=0;i <10;i++); 分号不要
cout < <rand()%100 < <" ";
cout < <endl;
return 0;
}

这个运行一下
41


45


41

这个函数的作用是什…
[/Quote]
The srand function sets the starting point for generating a series of pseudorandom integers. To reinitialize the generator, use 1 as the seed argument. Any other value for seed sets the generator to a random starting point. rand retrieves the pseudorandom numbers that are generated. Calling rand before any call to srand generates the same sequence as calling srand with seed passed as 1.

[ericli981]

[Quote=引用 2 楼 thecrypig 的回复:]
把#include "stdafx.h" 注释掉
#include "iostream.h" 改成#include "iostream"  using namespace std；
运行正确的啊

[/Quote]

没错，不用stdafx.h，使用<iostream>，加上using namespace std;

[liubuweiright]

#include "stdafx.h" //如果是用VC6.0.这句注释掉

srand(种子)


也不太懂,


顶

[thecrypig]

把#include "stdafx.h" 注释掉
#include "iostream.h" 改成#include "iostream" using namespace std；
运行正确的啊

[lzh9955]

#include "stdafx.h

[太乙]

#include<iostream>
using namespace std;

void main(void) 
{ 
	int i; 
	for (i=0;i <10;i++); 
	cout <<rand()%100 <<" "; 
	cout <<endl <<endl; 
	
	srand (2); 
	for (i=0;i <10;i++); 
	cout <<rand()%100 <<" "; 
	cout <<endl <<endl; 
	
	srand (1); 
	for (i=0;i <10;i++); 
	cout <<rand()%100 <<" "; 
	cout <<endl; 
}