Example/* RAND.C: This program seeds the random-number generator * with the time, then displays 10 random integers. */#include <stdlib.h> #include <stdio.h> #include <time.h>void main( void ) { int i; /* Seed the random-number generator with current time so that * the numbers will be different every time we run. */ srand( (unsigned)time( NULL ) ); /* Display 10 numbers. */ for( i = 0; i < 10;i++ ) printf( " %6d\n", rand() ); }
srand(a);
产生随机数
rand()
#include <iostream>
#include <time.h>
using namespace std;int main()
{
srand(unsigned(time(NULL)));
int a[9];
for(int i = 0 ; i < 9 ; i++)
{
if( i < 5)
a[i] = rand() % 1 + 2 ;
else
a[i] = rand() % 2;
} for(i = 0 ; i < 9 ;i++ )
cout<<a[i]<<' ' ; cout<<endl; return 0 ;
}产生5个2
这样写有局限性,主要是随机产生时设置一个rand()%?
lz可以就此改进
* with the time, then displays 10 random integers.
*/#include <stdlib.h>
#include <stdio.h>
#include <time.h>void main( void )
{
int i; /* Seed the random-number generator with current time so that
* the numbers will be different every time we run.
*/
srand( (unsigned)time( NULL ) ); /* Display 10 numbers. */
for( i = 0; i < 10;i++ )
printf( " %6d\n", rand() );
}