CODE IN C /** * Function: extract_window * Description: populates 2D array windo

Question

CODE IN C
/**

* Function: extract_window
* Description: populates 2D array window with sub-matrix
*               of landscape 2D array starting at column
*               start_col.
*               Returns 1 on success, 0 on failure.
*               Fails when start_col is not valid -- i.e.,
*               specifies a window not contained in the
*               landscape.
*
* Note: nrows applies to both the landscape and the window.
*/
extern int extract_window(char landscape[][L_WIDTH],
                                char window[][W_WIDTH],
                                int nrows, int start_column);

Explanation / Answer

#include <stdio.h>

#include "a.c"
#define L_WIDTH 80
#define W_WIDTH 20

extern int extract_window(char landscape[][L_WIDTH], char window[][W_WIDTH], int nrows, int start_column){
   if(start_column + W_WIDTH > L_WIDTH) return 0;
   int i, j;
   for(i = 0; i < nrows; i++){
       for(j = start_column; j < start_column + W_WIDTH; j++){
           landscape[i][j] = window[i][j];
       }
   }
   return 1;
}

int main(){
   char l[10][L_WIDTH], w[10][W_WIDTH];
   int i, j;
   for(i = 0; i < 10; i++){
       for(j = 0; j < W_WIDTH; j++){
           w[i][j] = '*';
       }
   }
   for(i = 0; i < 10; i++){
       for(j = 0; j < L_WIDTH; j++){
           l[i][j] = ' ';
       }
   }
   int temp = extract_window(l, w, 10, 5);
   if(temp == 0){
       printf("Invalid values ");
       return 0;
   }

   for(i = 0; i < 10; i++){
       for(j = 0; j < L_WIDTH; j++){
           printf("%c", l[i][j]);
       }
       printf(" ");
   }
}

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