rand.c

#include<stdio.h>
#include<stdlib.h>
#include<time.h>

// return _a ~_b random (include _b) and _a <= _b
#define RAND_INT(_a,_b) (rand()%(_b-_a+1) + _a) 

#define LINE_MIN 50
#define LINE_MAX 150

#define PER_MIN 0 //1
#define PER_MAX 30

#define NUM_MIN 1
#define NUM_MAX 500

int main()
{
	int i,j,le,ne;
	srand(time(NULL)); //give rand a seed
	
	//lines
	le = RAND_INT(LINE_MIN,LINE_MAX);
	for(i=0;i<le;++i)
	{
		//first
		printf("%d",RAND_INT(NUM_MIN,NUM_MAX));
		
		//per line
		ne = RAND_INT(PER_MIN,PER_MAX);
		
		for(j=0;j<ne;++j)
			printf(" %d",RAND_INT(NUM_MIN,NUM_MAX));
		
		putchar(10);
	}
	return 0;
}