4 basamaklı, basamakları yinelenmeyen rasgele (random) sayı üreten fonksiyon.
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#define SIZE 50
int rand_number(void);
int is_valid(int number);
int main(void)
{
int i, a[SIZE];
srand(time(NULL));
for (i = 0; i < SIZE; i++)
while (!is_valid(a[i] = rand_number()))
;
for (i = 0; i < SIZE; i++)
printf("%d ", a[i]);
putchar('\n');
return 0;
}
/*****************************************************************
1000 ile 9999 arasinda rasgele sayi ureten fonksiyon
*****************************************************************/
int rand_number(void)
{
return rand() % 9000 + 1000;
}
/****************************************************************
kendisine gonderilen sayinin kosula uygun, basamaklari tekrar
etmeyen bir sayi olup olmadigini test eden fonksiyon. uygunsa 1
degilse 0 degirini uretiyor.
*****************************************************************/
int is_valid(int number)
{
int temp, i, j;
for (i = 0; i < 10; i++) {
j = 0;
temp = number;
while (temp > 0) {
if (temp % 10 == i)
j++;
if (j > 1)
return 0;
temp /= 10;
}
}
return 1;
}
