this is my code, I dont know why it will not run perfectly?
Code:
int easy(int z)//EASY ROUND PROBLEM
{
    int elapTicks;

     double elapMilli, elapSeconds, elapMinutes;

     clock_t Begin, End;             //initialize Begin and End for the timer
 
      int cells (int z){
      char sudoku_prob[Z][Y][X]={
                         {
                          {'2','5','A','6','3','B','7','9','8'},
                          {'3','4','6','2','C','1','8','7','9'},
                          {'1','D','5','4','6','9','E','8','7'},
                          {'4','7','F','5','1','8','6','3','2'},
                          {'G','9','7','3','H','6','1','2','4'},
                          {'6','3','I','8','9','7','5','4','J'},
                          {'K','8','3','7','4','L','2','1','M'},
                          {'8','N','4','1','7','2','9','5','3'},
                          {'7','1','8','O','2','3','4','P','5'},
                         },
                         };   
   Begin = clock() * CLK_TCK;    //begin the timer
   // for(int a=1; a<=10000; a++);
     sleep(1000);
      //initialization of a 3D array where array[Z][Y][X] in a 3D Cartesian plane
           int i=1,x, y,check=0;
               for (y=0; y<Y; y++){
                        for (x=0; x<X; x++)
                        printf("%4c", sudoku_prob[z][y][x]);
                   printf("\n\n");
               }
               
        printf("\n\n");
        
           switch(z)
          {
            case 0:    printf("\nEnter for A: ");sudoku_prob[z][0][2]=getchar();getchar();
                       printf("Enter for B: ");sudoku_prob[z][0][5]=getchar();getchar();
                       printf("Enter for C: ");sudoku_prob[z][1][4]=getchar();getchar();
                       printf("Enter for D: ");sudoku_prob[z][2][1]=getchar();getchar();
                       printf("Enter for E: ");sudoku_prob[z][2][6]=getchar();getchar();
                       printf("Enter for F: ");sudoku_prob[z][3][2]=getchar();getchar();
                       printf("Enter for G: ");sudoku_prob[z][4][0]=getchar();getchar();
                       printf("Enter for H: ");sudoku_prob[z][4][4]=getchar();getchar();
                       printf("Enter for I: ");sudoku_prob[z][5][2]=getchar();getchar();
                       printf("Enter for J: ");sudoku_prob[z][5][8]=getchar();getchar();
                       printf("Enter for K: ");sudoku_prob[z][0][0]=getchar();getchar();
                       printf("Enter for L: ");sudoku_prob[z][6][5]=getchar();getchar();
                       printf("Enter for M: ");sudoku_prob[z][6][8]=getchar();getchar();
                       printf("Enter for O: ");sudoku_prob[z][8][3]=getchar();getchar();
                       printf("Enter for P: ");sudoku_prob[z][8][7]=getchar();getchar();
                       break;
         
         default: break;       
   }
          //Checking of answers     
          for (y=0; y<Y; y++){
              for (x=0; x<X; x++){
                  if (sudoku_ans[z][y][x]==sudoku_prob[z][y][x])
                  check++; 
             }
          }
            if (check==81)
            printf("\n\nAnswer Correct: Press any key to continue\n\n");
            else
            {
            printf("\n\nAnswer Incorrect: Press any key to continue\n\n");    
            check=0;
            }
        End = clock() * CLK_TCK;        //stop the timer
            return check;        
 }
    
     elapTicks = End - Begin;        //the number of ticks from Begin to End

     elapMilli = elapTicks/1000;     //milliseconds from Begin to End

     elapSeconds = elapMilli/1000;   //seconds from Begin to End

     elapMinutes = elapSeconds/60;   //minutes from Begin to End

     if(elapSeconds < 1)

          printf("\n\nIt took %d milliseconds.", elapMilli);

     else if(elapSeconds == 1)

          printf("\n\nIt took  1 second.");

     else if(elapSeconds > 1 && elapSeconds < 60)

          printf("\n\nIt took %d seconds.", elapSeconds);

     else if(elapSeconds >= 60)   

          printf("\n\nIt took  %d minutes.", elapMinutes);

  return 0;

 }