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9.8 Exercises

Given the following declaration:

int x[10][20];

Explain what each of the following represent:

1. x

2. x + i

3. *(x + i)

4. *(x + i) + j

5. *(*(x + i) + j)

6. x[0]

7. x[i]

8. x[i] + j

9. *(x[i] + j)

   Find and correct errors if any. What does the program do in each case?

10. main()
    {    int x[5][10];
    
         init(x[][]);
    }
    
    void init(int a[][])
    {    int i, j;
    
         for (i = 0; i < 10; i++)
              for (j = 0; j < 5; j++)
                   a[i][j] = 0;
    }

11. main()
    {    int x[5][10];
    
         init(x[][]);
    }
    
    void init(int *a)
    {    int i, j;
    
         for (i = 0; i < 10; i++)
              for (j = 0; j < 5; j++) {
                   *a = 0;
                   a++;
    }

12. main()
    {    char s[5][100];
    
         read_strings(s);
         print_strings(s);
    }
    
    read_strings(char s[][100])
    {
         for (i = 0; i < 5; i++) {
              gets(*s);
              s++;
         }
    }
    
    print_strings(char s[][100])
    {
         while (*s) {
              puts(s);
              s++;
         }
    }