C语言中生成指定范围内的随机数

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/time.h>
int main()
{
    struct timeval st;
    gettimeofday( &st, NULL );
    srand(st.tv_usec);
    printf( "%d -> %d\n", st.tv_usec, 1 + rand() % 9 );
    return 0;
}

/*打印结果*/

/*
$ ./a.out
9
$ ./a.out
6
$ ./a.out
3
$ ./a.out