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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3.  
  4. int main(void){
  5.     int a, b;
  6.     scanf("%d %d", &a, &b);
  7.  
  8.     int **mat;
  9.  
  10.     mat = (int **)malloc(sizeof(int *) * a);
  11.     if(mat == NULL){
  12.         printf("ERROR\n");
  13.         return 0;
  14.     }
  15.  
  16.     for(int i = 0; i < a; i++){
  17.         mat[i] = (int *)malloc(sizeof(int) * b);
  18.         if(mat[i] == NULL){
  19.             printf("ERROR\n");
  20.             return 0;
  21.         }
  22.     }
  23.  
  24.  
  25.     int num = 1;
  26.     for(int i = 0; i < a; i++){
  27.         for(int j = 0; j < b; j++){
  28.             mat[i][j] = num++;
  29.         }
  30.     }
  31.  
  32.     // ④ 出力
  33.     for(int i = 0; i < a; i++){
  34.         for(int j = 0; j < b; j++){
  35.             printf("%d", mat[i][j]);
  36.             if(j < b - 1) printf(" ");
  37.         }
  38.         printf("\n");
  39.     }
  40.  
  41.  
  42.     for(int i = 0; i < a; i++){
  43.         free(mat[i]);
  44.     }
  45.     free(mat);
  46.  
  47.     return 0;
  48. }
  49.  
Success #stdin #stdout 0s 5324KB
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https://ideone.com/lcUWm5
language:
C (gcc 8.3)
created:
23 hours ago
visibility:
public

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