Name and Surname = ex.3.1

#include <stdio.h>

int main()
/*write a program reading names and surnames of 15 student, storing them in an array and printing on the screen as follows;:
name and surname  or in a reserved order*/

{ // program  shows writing ( reading) the data into (from) multidimensional array
    char c;
    char tab [15][2][20];
    int n, i ;
    do
    {
        printf("Enter students number(n<16):");
        i = scanf("%d", &n);
        fflush(stdin);//stdio.h -clearing the buffer

    }
    while (i ==0);
    system("cls");////stdio.h -clearing the screen
    for ( i = 0; i <n; i ++)
    {
        printf("Enter name of %d student: ", i+1);
        scanf("%19s", &tab[i][0]);
        fflush(stdin);
        printf("Enter surname of %d student: ", i+1);
        scanf("%19s", &tab[i][1]);
        fflush(stdin);
        printf("\n");
    }
    printf("Printing firstly name, than suname? t\n");
    fflush(stdin);
    c = getchar();
    printf("\n");
    if(c == 't' || c == 'T')
        for( i = 0; i <n; i ++)
            printf("%d %s %s\n", i+1, tab[i][0],tab[i][1]);
    else for (i = 0; i <n; i ++)
            printf("%d %s %s\n", i+1, tab[i][1],tab[i][0]);
    getchar();
    return 0;
}