Problem with random numbers

[gregarion]

Hey guys , as from what i read up , the function srand() and rand() are able to give u random numbers if they are being run one time only. What i am trying to do is to produce a set of random and unique numbers from 1 - 10.

int main ()
{

    int num[10];
    

srand((unsigned)time(0));

int random_integer;

for(int index=0; index<10; index++){

random_integer = rand()%10;
num[index] = random_integer;
for(int i = 0;i< 10 ; i++)
{
    if(num[i] == random_integer){
        random_integer = rand()%10;
        num[i] = random_integer ;
    }
    
}
        cout << random_integer << endl;

}

What i try to do is to generate the random number, store it inside a array. Then within that for loop , i would do a check to see if the number already exist . if it does, another random number will be generated.

The problem i am facing is that, the number does not seem to replace itself. I tried various ways of playing around with the loop but to no avail. Hope for some help. Ty.

[LevyDee]

Your if statement is always going to be true no matter what starting off from the very first iteration.

[gregarion]

Oh yeah , i deleted that line off already, but same mistakes are coming up

using namespace std;
int main ()
{

    int num[10];
    

srand((unsigned)time(0));

int random_integer;

for(int index=0; index<10; index++){

random_integer = rand()%10;
for(int i = 0;i< index ; i++)
{
    if(num[i] == random_integer){
        random_integer = rand()%10;
        num[i] = random_integer ;
    }
    
}
        cout << random_integer << endl;

}
   
    

}

[WaltP]

random_integer = rand()%10;
for(int i = 0;i< index ; i++)
{
    if(num[i] == random_integer){    // Why are replacing a good number with a new number?
        random_integer = rand()%10;  // How do you know the new number isn't the same as the old number?
        num[i] = random_integer ;    // and what are the initial values of num when you start? (don't assume, check it out)
    }
    
}

[ixmike88]

i think something like this would work:

int nIndex = 0;
int nSize = sizeof(num)/sizeof(int);

while(nIndex < nSize) 
{
	int rndNumber = rand()%10;

	for(int i = 0; i < nSize; i++)
	{
		if(num[i] == rndNumber)
			break;

		if(i == nSize-1)
			num[nIndex++] = rndNumber;
	}
}