Random array in cpp

Question

how to print values of random array where there's not print same value. ex : arr[]{a,b,c} -> make random func -> print out c,a,b(random)..

Answer 1

#include <iostream>
#include <cstdlib>
#include <ctime>
using namespace std;

int main()
{
srand(time(0));

char array[5] = {0, 1, 2, 3, 4};

for (int i = 0; i < 5; i++)
{
cout << array[rand() % 5] << " ";
}

return 0;
}

The above code may, however, print array of duplicate indexes. To overcome this issue, a slight tweak is required but I am lazy. =^=

Answer 2

Oh. I reread the question. Guess it means that I have to stop being lazy.

// Functional code updated

#include <iostream>
#include <cstdlib>
#include <ctime>
using namespace std;

int main()
{
srand(time(0));

int array[5] = {0, 1, 2, 3, 4};
int array2[5];
int i = 0;
int j;
int checker;
bool ident;

while (i < 5)
{
ident = false;
checker = rand()%5;
j = 0;

while (j < 5)
{
if (checker == array2[j])
{
ident = true;
}
}
if (ident)
{
continue;
}
array2[i] = checker;
i++;
}

for (int k = 0; k < 5; k++)
{
cout << array[array2[k]] << " ";
}

return 0;
}

// this way, the elements of array[] will not repeat.

Answer 3

Code playground shows 'time limit exceeded' for my code above but it works on desktop compiler. Nvm, I'll think of another way.

Answer 4

OK, this is a *much much moar* garbage-less alternate.
However, your original array gets modified. Ntls, this can be easily overcame if needed.

#include <iostream>
#include <cstdlib>
#include <ctime>
#include <algorithm>
using namespace std;

int main()
{
srand(time(0));
int array[5] = {1,2,3,4,5};

for (int i = 0; i < 5; i++)
{
swap(array[rand() % 5], array[i]);
}

for (int j = 0; j < 5; j++)
{
cout << array[j] << " ";
}
return 0;
}

Answer 5

So erm, are things working now lol. I've lost track.

Answer 6

i've wrte that code before, my question is how to print out diferent rndom array. that code still probably print out same value

Answer 7

nice thx.. how can u do that guys.. awesome

Answer 8

no output from that code

Answer 9

//trying too

Answer 10

cool, but i dont know how line 16 work.. i think i should learn more about swap. thx a lot bro..