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  1. #include <stdio.h>
  2. #define sizeY 10
  3. #define sizeX 10
  4. #define LIVE 1
  5. #define DEAD 0
  6.  
  7. typedef struct {
  8.     int y;
  9.     int x;
  10.     unsigned char status;
  11. } TableType;
  12.  
  13.  
  14. void printTable(TableType grid[], int table_size) {
  15.     int i;
  16.     for (i = 0; i < table_size; i++) {
  17.       //printf ("P(%d,%d) = ", grid[i].x, grid[i].y); 
  18.  
  19.       if (i % sizeY == 0 && i != 0) {
  20.           printf("\n");
  21.       }
  22.  
  23.       if (grid[i].status == LIVE) {
  24.           printf("X");
  25.       } else {
  26.           printf("-");
  27.       }
  28.     }
  29.     printf("\n");
  30. }
  31.  
  32. void clearTable(TableType grid[], int table_size) {
  33.     int i = 0;
  34.     int height, width;
  35.     for (height = 0; height < sizeY; height++) {
  36.         for (width = 0; width < sizeX; width++) {
  37.             grid[i].y = height;
  38.             grid[i].x = width;
  39.             grid[i].status = DEAD;
  40.             //printf ("Setting P(%d,%d) to DEAD\n", width, height);
  41.             i++;
  42.         }
  43.     }
  44. }
  45.  
  46. int findIndexForPoint(TableType grid[], int table_size, int x, int y) {
  47.    int i;
  48.    for (i = 0; i < table_size; i++) {
  49.       if (grid[i].x == x && grid[i].y == y) {
  50.          // found it
  51.          return i;
  52.       }
  53.    }
  54.  
  55.    // not found, return -1;
  56.    return -1;
  57. }
  58.  
  59.  
  60. int main () {
  61.    TableType grid[sizeX*sizeY] = {0};
  62.    clearTable(grid, sizeX*sizeY);
  63.  
  64.    // access via index but you are not sure which x,y
  65.    grid[10].status = LIVE; 
  66.  
  67.    // This way you know exactly which x,y
  68.    int index = findIndexForPoint (grid,sizeX*sizeY,5,3);
  69.    if (index != -1) {
  70.       grid[index].status = LIVE;
  71.    }
  72.  
  73.    printTable(grid, sizeX*sizeY);
  74. }
Success #stdin #stdout 0s 10304KB
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Standard input is empty
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----------
X---------
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-----X----
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https://ideone.com/To2uL5
language:
C (gcc 8.3)
created:
6 years ago
visibility:
public

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