#include <stdio.h>
#include <math.h>
int pick, i, a, b, j;
int q[100];
float tmp;
int u;
int p=0;
int m[50][50];
int z[100];
int n[5][5] = {
  {1, 2, 3, 4, 5},
  {5, 6, 7, 8, 9},
  {9, 10, 11, 12, 13},
  {13, 14, 15, 16, 17},
  {17, 18, 19, 20, 21}
};
int
main ()
{
    printf ("Press 1 if you want to enter your own matrix..\n");
    printf ("Press 2 if you want to use a predetermined matrix..\n");
    scanf ("%d", &pick);
        for(i=0;i<100;i++)
            {
                z[i]=0;
            }
if (pick == 1)
    {
        printf ("How many rows do you want in your matrix?\n");
        scanf ("%d\n", &a);
        printf ("How many columns do you want in your matrix?\n");
        scanf ("%d\n", &b);
        printf ("Enter the elements of your matrix row by row..\n");
        for(i=0;i<a;i++)
            {
                for(j=0;j<b;j++)
                    {
                        printf("Enter the [%d][%d] element ",i+1,j+1);
                        scanf("%d\n",&m[i][j]);
                    }
            }
        printf ("Your matrix is..\n");
        for (i = 0; i < a; i++)
            {
                for (j = 0; j < b; j++)
                    {
                        printf ("[%d]", m[i][j]);
                    }
                printf ("\n");
            }
//////////////////////// Above this im having problems printing the correct matrix. I enter 1,2,3 and it prints 3,1,2
    printf("Press 1 for the average.. Press 2 for the standard deviation ");
        scanf ("%d", &pick);
        if (pick==1)
            {
                printf("Press 1 to choose the average per row.. Press 2 for per column ");
                scanf ("%d", &pick);
                    if (pick == 1)
                        {
                            printf ("This matrix has %d rows, which do you want to print? ",a);
                            scanf ("%d", &pick);
                            tmp = 0;
                            for (i = 0; i < a; i++)
                                {
                                    tmp = tmp + m[pick - 1][i];
                                }
                            tmp = tmp * 0.2;
                            printf ("%d is the average of row %d", tmp, pick);
                        }
                    else if (pick==2)
                        {
                            printf("This matrix has 5 columns, which do you want to print? ");
                            scanf ("%d", &pick);
                            tmp = 0;
                            for (i = 0; i < b; i++)
                                {
                                    tmp = tmp + m[i][pick - 1];
                                }
                            tmp = tmp * 0.2;
                            printf ("%d is the average of column %d", tmp, pick);
                        }
            }
        else if (pick == 2)
            {
                printf("Press 1 for the standard devation per row.. Press 2 per column ");
                scanf ("%d",&pick);
                if (pick == 1)
                    {
                        printf ("This matrix has %d rows, which do you want to print? ",a);
                        scanf ("%d", &pick);
                        u = 0;
                        for (i = 0; i < a; i++)
                            {
                                u = u + m[pick - 1][i];
                            }
                        u = u*0.2;
                        for(i=0;i<a;i++)
                            {
                                z[i]=m[pick-1][i]-u;
                            }
                        for(i=0;i<a;i++)
                            {
                                z[i]=z[i]*z[i];
                                p=p+z[i];
                            }
                        printf("The standard deviation of the %d row is sqrt(%d/%d)",pick,p,a-1);
                    }
                else if (pick == 2)
                    {
                        printf ("This matrix has %d columns, which do you want to print? ",b);
                        scanf ("%d", &pick);
                        u = 0;
                        for (i = 0; i < b; i++)
                            {
                                u = u + m[i][pick-1];
                            }
                        u = u*0.2;
                        for(i=0;i<b;i++)
                            {
                                z[i]=m[i][pick-1]-u;
                            }
                        for(i=0;i<b;i++)
                            {
                                z[i]=z[i]*z[i];
                                p=p+z[i];
                            }
                        printf("The standard deviation of the %d column is sqrt(%d/%d)",pick,p,b-1);
                    }
            }
    }

///////////////////////////////// Ends the personal matrix code
else if (pick==2)
    {
        printf ("The predetermined matrix is..\n");
        for (i = 0; i < 5; i++)
            {
                for (j = 0; j < 5; j++)
                    {
                        printf ("[%d]", n[i][j]);
                    }
                printf ("\n");
            }



        printf("Press 1 for the average.. Press 2 for the standard deviation ");
        scanf ("%d", &pick);
        if (pick==1)
            {
                printf("Press 1 to choose the average per row.. Press 2 for per column ");
                scanf ("%d", &pick);
                    if (pick == 1)
                        {
                            printf ("This matrix has 5 rows, which do you want to print? ");
                            scanf ("%d", &pick);
                            tmp = 0;
                            for (i = 0; i < 5; i++)
                                {
                                    tmp = tmp + n[pick - 1][i];
                                }
                            tmp = tmp * 0.2;
                            printf ("%d is the average of row %d", tmp, pick);
                        }
                    else if (pick==2)
                        {
                            printf("This matrix has 5 columns, which do you want to print? ");
                            scanf ("%d", &pick);
                            tmp = 0;
                            for (i = 0; i < 5; i++)
                                {
                                    tmp = tmp + n[i][pick - 1];
                                }
                            tmp = tmp * 0.2;
                            printf ("%d is the average of column %d", tmp, pick);
                        }
            }
        else if (pick == 2)
            {
                printf("Press 1 for the standard devation per row.. Press 2 per column ");
                scanf ("%d",&pick);
                if (pick == 1)
                    {
                        printf ("This matrix has 5 rows, which do you want to print? ");
                        scanf ("%d", &pick);
                        u = 0;
                        for (i = 0; i < 5; i++)
                            {
                                u = u + n[pick - 1][i];
                            }
                        u = u*0.2;
                        for(i=0;i<5;i++)
                            {
                                z[i]=n[pick-1][i]-u;
                            }
                        for(i=0;i<5;i++)
                            {
                                z[i]=z[i]*z[i];
                                p=p+z[i];
                            }
                        printf("The standard deviation of the %d row is sqrt(%d/4)",pick,p);
                    }
                else if (pick == 2)
                    {
                        printf ("This matrix has 5 columns, which do you want to print? ");
                        scanf ("%d", &pick);
                        u = 0;
                        for (i = 0; i < 5; i++)
                            {
                                u = u + n[i][pick-1];
                            }
                        u = u*0.2;
                        for(i=0;i<5;i++)
                            {
                                z[i]=n[i][pick-1]-u;
                            }
                        for(i=0;i<5;i++)
                            {
                                z[i]=z[i]*z[i];
                                p=p+z[i];
                            }
                        printf("The standard deviation of the %d column is sqrt(%d/4)",pick,p);
                    }
            }
    }
}