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11.6 Exercises

1. If the characters in an array, s are: string0 of characters0

   What does each of the following print? Show each character.

   printf("%s", s);
       puts(s);
       fputs(s, stdout);

2. If the input of characters is:

   string of characters\n

   What does each of the following read? Show each character, including NULL.

   scanf("%s", s);
       gets(s);
       fgets(s, sizeof(s) - 1, stdin);

3. Assume s is a string array. Under what condition is each of the following True?

   s
       *s
       !*s
       gets(s)
       *gets(s)
       !*gets(s)

   Find and correct any errors in the following and determine the outputs where feasible. The input is shown when appropriate.

4. main()
   {   char s[80], t[80];
   
       s = "this is a message";
       if (s == t)
            printf("Equal\n");
       else
            printf("Not equal\n");
       puts(s);
   }

5. main()
   {   char s[80], t[80];
   
       scanf("%s", s);
       printf("%s", s);
   }

   Input: This is a message

6. main()
   {   char *s;
   
       s = "this is a message";
       printf("%d  %s\n", s, s);
       puts(s);
   }

7. main()
   {   char *s;
   
       gets(s);
       puts(s);
   }

8. main()
   {   char s[80];
   
       while (*s) {
            putchar(*s);
            s++;
       }
   }

9. main()
   {   char *s;
   
       strcpy(s, "hello");
       puts(s);
   }

10. main()
    {   char name[80];
    
        name = get_str(name);
        puts(s);
    }
    
    char *get_str(char *s)
    {
        gets(s);
        return s;
    }

11. int cmpstr(char *s, char *t)
    {
        if (s == t)
             return TRUE;
        else
             return FALSE;
    }