Generating Unique Random Numbers in an Array using Loop

Question

So the question is to develop a [5][5] table, each containing unique numbers from 1-100 (no duplicates)

so here\'s what I came up with:

#inc         


        

Answer 1

C stores arrays in row-major order, i.e, the elements of row 0 comes first , followed by the elements of row 1, and so forth.

We can take advantage of this by viewing int board[5][5] as int board[5*5].

#include 
#include 
#include 
#define N 5

int main()
{
    int i, outerLoop = 1;
    int board[N*N];

    srand(time(NULL));

    int number;
    board[0] = rand() % 100 + 1; //initializing the first element

    while(1)
    {
            number = rand() % 100 + 1 ;

            if(outerLoop == N*N)
                break;      
            else
            {
                //Cheking the previous elements for no duplicacy
                for ( i = 0; i < outerLoop; i++)
                {
                    if(number == board[i])
                        break;
                }

                //confirming whether all the elements are checked or not and the assigning number to the array element and then increment the counter outerLoop 
                if(i == outerLoop)
                {
                    board[outerLoop] = number;
                    outerLoop++;
                }
                else
                    continue;
            }

    }

    //Printing the elements of array board[N*N]
    for (  outerLoop = 0  ;  outerLoop < N*N  ; outerLoop++ )
    {
        printf( "%d\t", board[outerLoop] );
        if(outerLoop % N == 4)
            printf("\n\n");
    }

}