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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.     mat = (int **)malloc(a * sizeof(int *));
  12.     if(mat == NULL){
  13.         printf("ERROR\n");
  14.         return 0;
  15.     }
  16.  
  17.     for(i = 0; i < a; i++){
  18.         mat[i] = (int *)malloc(b * sizeof(int));
  19.         if(mat[i] == NULL){
  20.             printf("ERROR\n");
  21.             for(j = 0; j < i; j++) free(mat[j]);
  22.             free(mat);
  23.             return 0;
  24.         }
  25.     }
  26.  
  27.     // 1から始まる連番で代入
  28.     int count = 1;
  29.     for(i = 0; i < a; i++){
  30.         for(j = 0; j < b; j++){
  31.             mat[i][j] = count++;
  32.         }
  33.     }
  34.  
  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.     for(i = 0; i < a; i++){
  43.         free(mat[i]);
  44.     }
  45.     free(mat);
  46.  
  47.     return 0;
  48. }
  49.  
Success #stdin #stdout 0.01s 5288KB
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https://ideone.com/13jvzm
language:
C (gcc 8.3)
created:
10 days ago
visibility:
public

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