运行这个后 为什么每次rand（）所选的随机数是一样的都是41
！！！？？？？


#include <stdio.h>
#include <stdlib.h>
void main()
{
int m,n;
m= rand();
printf("Please guess a number:");
scanf("%d",&n);
if (n> m)
{
printf("Too high");
}
else if (n <m)
{
printf("Too low");
}
else
{
printf("Right \n");
printf("The number m is :%d\n",m);
}
}

种子没改变所以每次都是一样的伪随机数

谢谢！知道了！
因为提供的随机种子数相同 所以不变
可以使用计算机读取其时时钟并把该值自动设置成随机种子数 用这个语句
srand (time (NULL) )；
搞定！！

我是以时间为种子,

你可能是要编那种猜数字的游戏吧?你程序都写错了
#include <stdio.h>
#include <stdlib.h>
#include<time.h>
void main()
{
time_t t;
int m,n;
srand((unsigned) time(&t));
m= rand();
printf("Please guess a number:");
scanf("%d",&n);

while(n!=m)
{
if (n> m)
{
printf("Too high");
printf("Please guess a number:");
scanf("%d",&n);

}
else if (n <m)
{
printf("Too low");
printf("Please guess a number:");
scanf("%d",&n);
}
}

if(m=n)
{printf("Right \n");
printf("The number m is :%d\n",m);
}
}

这样写可以吗？


#include <stdio.h>
#include <stdlib.h>
#include <time.h>
void main()
{
int m,n;
srand(time(NULL));
m= rand();
printf("Please guess a number:");
scanf("%d",&n);
if (n> m)
{
printf("Too high\n");
}
else if (n <m)
{
printf("Too low\n");
}
else
{
printf("Right \n");
printf("The number m is :%d\n",m);
}
}

我想我的程序应该把srand(time(NULL));
改成 srand( (unsigned)time( NULL ) );
更合适 对吧！

序都写错了
#include <stdio.h>
#include <stdlib.h>
#include<time.h>
void main()
{
time_t t;
int m,n;
srand((unsigned) time(&t));
m= rand();
printf("Please guess a number:");
scanf("%d",&n);

while(n!=m)
{
if (n> m)
{
printf("Too high");
printf("Please guess a number:");
scanf("%d",&n);

}
else if (n <m)
{
printf("Too low");
printf("Please guess a number:");
scanf("%d",&n);
}
}

if(m=n)
{printf("Right \n");
printf("The number m is :%d\n",m);
}
}这还是真的啊

序都写错了
#include <stdio.h>
#include <stdlib.h>
#include<time.h>
void main()
{
time_t t;
int m,n;
srand((unsigned) time(&t));
m= rand();
printf("Please guess a number:");
scanf("%d",&n);

while(n!=m)
{
if (n> m)
{
printf("Too high");
printf("Please guess a number:");
scanf("%d",&n);

}
else if (n <m)
{
printf("Too low");
printf("Please guess a number:");
scanf("%d",&n);
}
}

if(m=n)
{printf("Right \n");
printf("The number m is :%d\n",m);
}
}还是真的啊

为什么要三个这样的#include <stdio.h>
高手们可以说说吗

楼上具体什么意思？
是问头文件的作用吗？