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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3.  
  4. //必要があれば変数などを追加してもOKです
  5.  
  6. int main(){
  7.     int i,j,k;
  8.     int a,b;
  9.     int **mat;
  10.     scanf("%d %d",&a,&b);
  11.  
  12. 	//ここで2次元配列の動的確保をする
  13.     mat = (int **)malloc(a * sizeof(int *));
  14.     if (mat == NULL) {
  15.         fprintf(stderr, "Memory allocation failed for rows.\n");
  16.         return 1;
  17.     }
  18.     for (i = 0; i < a; i++) {
  19.         mat[i] = (int *)malloc(b * sizeof(int));
  20.         if (mat[i] == NULL) {
  21.             fprintf(stderr, "Memory allocation failed for columns in row %d.\n", i);
  22.             for (int k_free = 0; k_free < i; k_free++) {
  23.                 free(mat[k_free]);
  24.             }
  25.             free(mat);
  26.             return 1;
  27.         }
  28.     }
  29.  
  30. 	//ここで2次元配列に数値を代入する
  31.     k = 1;
  32.     for (i = 0; i < a; i++) {
  33.         for (j = 0; j < b; j++) {
  34.             mat[i][j] = k++;
  35.         }
  36.     }
  37.  
  38.     //以下の部分は表示の部分です
  39.     //いじらなくてOK
  40.     for(i=0;i<a;i++){
  41.         for(j=0;j<b;j++){
  42.             printf("%d ",mat[i][j]);
  43.         }
  44.         printf("\n");
  45.     }
  46.  
  47.     //さて，最後に忘れずにすることと言えば？
  48.     for (i = 0; i < a; i++) {
  49.         free(mat[i]);
  50.     }
  51.     free(mat);
  52.  
  53.     return 0;
  54. }
Success #stdin #stdout 0s 5284KB
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https://ideone.com/SaUUdH
language:
C (gcc 8.3)
created:
7 days ago
visibility:
public

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