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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3.  
  4. int main() {
  5.     int a, b;
  6.  
  7.     // 入力を受け取る
  8.     printf("行数と列数を入力してください (例: 2 3): ");
  9.     scanf("%d %d", &a, &b);
  10.  
  11.     // 動的な2次元配列を確保
  12.     int **matrix = (int **)malloc(a * sizeof(int *));
  13.     for (int i = 0; i < a; i++) {
  14.         matrix[i] = (int *)malloc(b * sizeof(int));
  15.     }
  16.  
  17.     // 配列に値を代入
  18.     int value = 1;
  19.     for (int i = 0; i < a; i++) {
  20.         for (int j = 0; j < b; j++) {
  21.             matrix[i][j] = value++;
  22.         }
  23.     }
  24.  
  25.     // 配列を指定のフォーマットで出力
  26.     for (int i = 0; i < a; i++) {
  27.         for (int j = 0; j < b; j++) {
  28.             printf("%d ", matrix[i][j]);
  29.         }
  30.         printf("\n");
  31.     }
  32.  
  33.     // メモリを解放
  34.     for (int i = 0; i < a; i++) {
  35.         free(matrix[i]);
  36.     }
  37.     free(matrix);
  38.  
  39.     return 0;
  40. }
  41.  
Success #stdin #stdout 0s 5284KB
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2
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stdout
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行数と列数を入力してください (例: 2 3): 1 2 3 
4 5 6
https://ideone.com/o1H0Ab
language:
C (gcc 8.3)
created:
5 days ago
visibility:
public

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