# rand() help trying to loop it till it finds all numbers in range 4x

Discussion in 'C' started by shredder2500, Sep 21, 2010.

1. ### shredder2500New Member

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what code can i use to make a loop that will find random numbers in the rang of 1 - 13 till all numbers in that range are used 4 times

this is what i would use to just make a loop that finds random numbers

for (int x; x <= 52; x++) // loop till x = 52
{
srand((unsigned)time(NULL)); // seed rand
y += 1 + rand() % (13); //find a random number in the rang of 1 - 13
cout << y << endl; // display random number
}

2. ### xpi0t0sMentor

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Here's one way:
Code:
```void test30()
{
int test;
srand((unsigned)time(NULL));
for (int i=0; i<13; test[i++]=0) ;
int count=0, p=0;
while (count<52)
{
int r=rand()%13;
if (test[r]<4)
{
test[r]++;
count++;
printf("%2d ",r+1);
p++;
if (p>12)
{
printf("\n");
p=0;
}
}
}
}
```