产生随即数用什么头?还有涵数是怎么写来的?

#include <stdlib.h>
int a;
randomize();/*随机函数初始化*/
a=random(100);/*0<= a <100*/

#include<stdio.h>
#include <stdlib.h>
#include <time.h>
void srand( unsigned seed );
int rand( void );
int i;
void main(){
srand( time(NULL) );
for( i = 1; i < 11; i++ )
printf( "Random number #%d: %d\n", i, rand() );
}