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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3.  
  4. int main(){
  5.     int i, j, k;
  6.     int rows, cols;
  7.     int **mat;
  8.  
  9.     scanf("%d %d", &rows, &cols);
  10.  
  11.     mat = (int **)malloc(sizeof(int *) * rows);
  12.     if(mat == NULL){
  13.         printf("ERROR: Failed to allocate memory for rows.\n");
  14.         return 0;
  15.     }
  16.  
  17.     for(i = 0; i < rows; i++){
  18.         mat[i] = (int *)malloc(sizeof(int) * cols);
  19.         if(mat[i] == NULL){
  20.             printf("ERROR: Failed to allocate memory for columns at row %d.\n", i);
  21.             return 0;
  22.         }
  23.     }
  24.  
  25.     k = rows * cols;
  26.     for(i = 0; i < rows; i++){
  27.         for(j = 0; j < cols; j++){
  28.             mat[i][j] = k--;
  29.         }
  30.     }
  31.  
  32.     for(i = 0; i < rows; i++){
  33.         for(j = 0; j < cols; j++){
  34.             printf("%3d ", mat[i][j]);
  35.         }
  36.         printf("\n");
  37.     }
  38.  
  39.     for(i = 0; i < rows; i++){
  40.         free(mat[i]);
  41.     }
  42.     free(mat);
  43.  
  44.     printf("Memory freed and program ended.\n");
  45.     return 0;
  46. }
Success #stdin #stdout 0.01s 5264KB
comments (?)
stdin
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2 3
stdout
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  6   5   4 
  3   2   1 
Memory freed and program ended.
https://ideone.com/6OE5vZ
language:
C (gcc 8.3)
created:
9 days ago
visibility:
public

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