[Urgent] Need help, unique random numbers.

[ronnchpra]

Hello,

I need help generating 50 unique numbers using rand() BETWEEN 1 and 100 and assign them to a array. I have worked out the number randomization and assignment, but I cant figure out how to generate unique numbers. Can anyone modify this code so that it generates or rather assigns only the unique number to the array:

#include <cstdlib>
#include <iostream>
#include <iomanip>
#include <time.h>
#include <cstring>

using namespace std;

int main()
{
int num,anum[50];
srand ((int)time(NULL ));

for (int i=1; i<=50; i++) {
num = ( 1 + rand() % 100);
anum[i] = num;
cout << setw(5) << anum[i];
if (i % 5 == 0) {
cout << endl;
}
}
return 0;
}

Any help is greatly appreciated.

thanks

[Ganon11]

Once you have generated the random number, you can have a second for loop (with index j) from 0 to i - 1, checking each previously assigned element of the array. If the element at array[j] equals the element you just assigned (array[i]), then subtract 1 from i (so that the ith element will be randomly assigned again) and break from the second for loop.

[ronnchpra]

Once you have generated the random number, you can have a second for loop (with index j) from 0 to i - 1, checking each previously assigned element of the array. If the element at array[j] equals the element you just assigned (array[i]), then subtract 1 from i (so that the ith element will be randomly assigned again) and break from the second for loop.

#include <cstdlib>
#include <iostream>
#include <iomanip>
#include <time.h>
#include <cstring>

using namespace std;

int main()
{
int num,anum[50];
srand ((int)time(NULL ));


for (int i=1; i<=50; i++) {
num = ( 1 + rand() % 100);
anum[i] = num;

for (int j=1; j<=-1; j++) {
if (anum[j] == anum[i]) {
i = i-1;
break;
}
}

cout << setw(5) << anum[i];
if (i % 5 == 0) {
cout << endl;
}
}
return 0;
}

just tried that man, still no resolve, it still for some reason assigns same numbers to 2 or more array

[ronnchpra]

Hmm wait a min, I think I read your response wrong.

#include <cstdlib>
#include <iostream>
#include <iomanip>
#include <time.h>
#include <cstring>

using namespace std;

int main()
{
int num,anum[50];
srand ((int)time(NULL ));

for (int i=1; i<=50; i++) {
num = ( 1 + rand() % 100);
anum[i] = num;

for (int j=0; j<=i-1; j++) {
if (anum[j] == anum[i]) {
i = i-1;
break;
}
}

}

for (int z=1; z<=50; z++) {
cout << setw(5) << anum[z];
if (z % 5 == 0) {
cout << endl;
}

}
return 0;
}

WORKED LIKE A CHARM.... thanks a lot man.. thanks a lot