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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3.  
  4. int main(){
  5.     int i, j;
  6.     int a, b;
  7.     int **mat;
  8.  
  9.     scanf("%d %d", &a, &b);
  10.  
  11.     //---- 2次元配列の動的確保 ----
  12.     mat = (int**)malloc(sizeof(int*)*a);
  13.     if(mat == NULL){
  14.         printf("ERROR\n");
  15.         return 0;
  16.     }
  17.  
  18.     for(i = 0; i < a; i++){
  19.         mat[i] = (int*)malloc(sizeof(int)*b);
  20.         if(mat[i] == NULL){
  21.             printf("ERROR\n");
  22.             return 0;
  23.         }
  24.     }
  25.  
  26.     //---- [0][0] から順に 1,2,3,... を代入 ----
  27.     int val = 1;
  28.     for(i = 0; i < a; i++){
  29.         for(j = 0; j < b; j++){
  30.             mat[i][j] = val++;
  31.         }
  32.     }
  33.  
  34.     //---- 表示 ----
  35.     for(i = 0; i < a; i++){
  36.         for(j = 0; j < b; j++){
  37.             printf("%d ", mat[i][j]);
  38.         }
  39.         printf("\n");
  40.     }
  41.  
  42.     //---- メモリ解放 ----
  43.     for(i = 0; i < a; i++){
  44.         free(mat[i]);
  45.     }
  46.     free(mat);
  47.  
  48.     return 0;
  49. }
  50.  
  51.  
  52.  
Success #stdin #stdout 0.01s 5248KB
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https://ideone.com/cvoqOZ
language:
C (gcc 8.3)
created:
2 days ago
visibility:
public

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