Final Exam 2 (20%)

Question

A string p is a prefix of a string s if the leading characters of s are identical to p. For example, "abc" is a prefix of "abcde". Develop a function prefix that checks if a C string p is a prefix of another C string s.

p是s的前綴若s開頭的一段字串等於p。例如，"abc"是"abcde"的前綴。寫一個程式 判斷字串p是否字串s的前綴。

Example input 1:

abc
abcde

Example output 1:

abc is a prefix of abcde

 

Example input 2:

bc
abcde

Example output 2:

bc is not a prefix of abcde

 

Answer 1

Hidden content!
** ***  * ** *   * 
  * **  ** ***   *****

int main()
{
* ****     ** *  char  ******
      *  *  * ** int i,c=0;
*   *         *  **             * ***  ***   *   *     
**   *   ***  *  ** ***** *  **    **  * **    * *
***  * *     *   *** * **   * 
** ***   * *** {
 **     *      * * * **** ** * * * 
  *      ** * *  *      * *  {
**  ***  *  * ** *  *     * ** *     **  *  *  *  * ** *  *******  *  
*   *  *  *    ** * ** * *  * * ** *  ** **  *** **  *  {
*   *  *               ***  *   *** c=0;
  *** * *   ***  * *  *  *   ***   **** *** ****    *   *** ***  ** }
 *  * ** *  **  *   **  * **   * *   *   else **    *  *  *  *  ** * **** 
*** **   ***** *  ** * **  *    *  **    * * ** **   *    *** {
****  *  * **  ** * *    **   *  * * **   ****       *  * *  * *  *  *      **  c++;
  * *  *  *     *******   *****  * * * * *  *   * * *   ****** }
   *** * *   *     *  *  *  }
***   * * ***   
 ** ***  * *  **  if(c==0)
* ***** *  * ** *   *******  *   * *  *  is not a prefix of  *    *  * 
 ** ** *  *    * * else
   **      * *    *  *  * *    * *** * is a prefix of   **     *  
*  *   * *  *  }
  *   **  *   return 0;
}

Comments

prog.c: In function 'main':
prog.c:8:11: warning: format '%s' expects argument of type 'char *', but argument 2 has type 'char (*)[10]' [-Wformat=]
   scanf("%s",&a);
           ^
prog.c:9:11: warning: format '%s' expects argument of type 'char *', but argument 2 has type 'char (*)[10]' [-Wformat=]
   scanf("%s",&b);
           ^

---

Case 0: Wrong output
Case 1: Wrong output
Case 2: Wrong output

---

Case 0: Correct output
Case 1: Wrong output
Case 2: Correct output

---

Case 0: Correct output
Case 1: Wrong output
Case 2: Correct output

---

prog.c: In function 'main':
prog.c:10:6: warning: implicit declaration of function 'stlen' [-Wimplicit-function-declaration]
   if(stlen(b)>strlen(a))
      ^~~~~
/tmp/ccnE3ufV.o: In function `main':
prog.c:(.text+0x5b): undefined reference to `stlen'
collect2: error: ld returned 1 exit status

---

Case 0: Correct output
Case 1: Wrong output
Case 2: Correct output

---

Case 0: Correct output
Case 1: Wrong output
Case 2: Correct output

---

Case 0: Wrong output
Case 1: Correct output
Case 2: Wrong output

---

Case 0: Correct output
Case 1: Wrong output
Case 2: Correct output

---

Case 0: Correct output
Case 1: Wrong output
Case 2: Correct output

---

Case 0: Wrong output
Case 1: Wrong output
Case 2: Wrong output

---

Case 0: Correct output
Case 1: Correct output
Case 2: Correct output

Answer 2

Hidden content!
**   **  *  * *  *    
 *    ******  ****** 
int main()
{
     *   *  * ** ap;
 *  * *    * ** * * *   * ****  ****      *  *  || ap=a)
 *****  *     ** * ******   *** *   ***    is a prefix of abcde\n");
 ***  ****  *  * 
***** *   
**** *  *  ****  **  ***  ** ** ** ** * is not a prefix of abcde");
*  * *   *  * *   *    * ***  *  *  ***** *   *  ** * ** *  ** * *     * *    *      0;
* ***  ****   * ***   **     *   * **      **** ******  *   ** *** *  * * 
  

Comments

prog.c: In function 'main':
prog.c:6:10: error: 'a' undeclared (first use in this function)
   if(ap>=a&&ap<=z || ap=a)
          ^
prog.c:6:10: note: each undeclared identifier is reported only once for each function it appears in
prog.c:6:17: error: 'z' undeclared (first use in this function)
   if(ap>=a&&ap<=z || ap=a)
                 ^
prog.c:10:12: warning: missing terminating " character
     printf("bc is not a prefix of abcde);
            ^
prog.c:10:12: error: missing terminating " character
     printf("bc is not a prefix of abcde);
            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
prog.c:11:12: error: expected expression before 'return'
            return 0;
            ^~~~~~
prog.c:12:12: error: expected ';' before '}' token
            }
            ^
prog.c:12:12: error: expected declaration or statement at end of input

---

prog.c: In function 'main':
prog.c:6:10: error: 'a' undeclared (first use in this function)
   if(ap>=a&&ap<=z || ap=a)
          ^
prog.c:6:10: note: each undeclared identifier is reported only once for each function it appears in
prog.c:6:17: error: 'z' undeclared (first use in this function)
   if(ap>=a&&ap<=z || ap=a)
                 ^
prog.c:10:12: warning: missing terminating " character
     printf("bc is not a prefix of abcde);
            ^
prog.c:10:12: error: missing terminating " character
     printf("bc is not a prefix of abcde);
            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
prog.c:11:12: error: expected expression before 'return'
            return 0;
            ^~~~~~
prog.c:12:12: error: expected ';' before '}' token
            }
            ^
prog.c:12:12: error: expected declaration or statement at end of input

---

prog.c: In function 'main':
prog.c:6:10: error: 'a' undeclared (first use in this function)
   if(ap>=a&&ap<=z || ap=a)
          ^
prog.c:6:10: note: each undeclared identifier is reported only once for each function it appears in
prog.c:6:17: error: 'z' undeclared (first use in this function)
   if(ap>=a&&ap<=z || ap=a)
                 ^
prog.c:10:12: warning: missing terminating " character
     printf("bc is not a prefix of abcde);
            ^
prog.c:10:12: error: missing terminating " character
     printf("bc is not a prefix of abcde);
            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
prog.c:11:12: error: expected expression before 'return'
            return 0;
            ^~~~~~
prog.c:12:12: error: expected ';' before '}' token
            }
            ^
prog.c:12:12: error: expected declaration or statement at end of input

---

prog.c: In function 'main':
prog.c:6:10: error: 'a' undeclared (first use in this function)
   if(ap>=a&&ap<=z || ap=a)
          ^
prog.c:6:10: note: each undeclared identifier is reported only once for each function it appears in
prog.c:6:17: error: 'z' undeclared (first use in this function)
   if(ap>=a&&ap<=z || ap=a)
                 ^
prog.c:10:12: warning: missing terminating " character
     printf("bc is not a prefix of abcde);
            ^
prog.c:10:12: error: missing terminating " character
     printf("bc is not a prefix of abcde);
            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
prog.c:11:12: error: expected expression before 'return'
            return 0;
            ^~~~~~
prog.c:12:12: error: expected ';' before '}' token
            }
            ^
prog.c:12:12: error: expected declaration or statement at end of input

---

prog.c: In function 'main':
prog.c:6:10: error: 'a' undeclared (first use in this function)
   if(ap>=a&&ap<=z || ap=a)
          ^
prog.c:6:10: note: each undeclared identifier is reported only once for each function it appears in
prog.c:6:17: error: 'z' undeclared (first use in this function)
   if(ap>=a&&ap<=z || ap=a)
                 ^
prog.c:12:12: error: expected declaration or statement at end of input
            }
            ^

---

prog.c: In function 'main':
prog.c:6:10: error: 'a' undeclared (first use in this function)
   if(ap>=a&&ap<=z || ap=a)
          ^
prog.c:6:10: note: each undeclared identifier is reported only once for each function it appears in
prog.c:6:17: error: 'z' undeclared (first use in this function)
   if(ap>=a&&ap<=z || ap=a)
                 ^
prog.c:12:12: error: expected declaration or statement at end of input
            }
            ^

---

prog.c: In function 'main':
prog.c:6:10: error: 'a' undeclared (first use in this function)
   if(ap>=a&&ap<=z || ap=a)
          ^
prog.c:6:10: note: each undeclared identifier is reported only once for each function it appears in
prog.c:6:17: error: 'z' undeclared (first use in this function)
   if(ap>=a&&ap<=z || ap=a)
                 ^
prog.c:12:12: error: expected declaration or statement at end of input
            }
            ^

Answer 3

Hidden content!
 ** *       **** ** 
  **  *  ** *  **

char p[1000],s[1000];
int i,pl,sl;

int test(char p[],char s[],int pl, int sl)
{
    * **  *  *     * **  ** ***  i<pl; i++)
   * *** *** *    * * *  **
 ** *    *** ** ****   **   * **  *   *** **** * **  (p[i]==s[i])
   *   * *****  * ** ** *    ** ***  ** **    *** *****    
  *  * * **   * *   ** * **** * *  * *    **  **   *****  ***** *     **** *   ****** *   
    *    * *   **** * * *   * *** **   **   *****   * **   ** *** * *    ** *  **
  * * ** *    * ** ** *     ***   **   * * ***   **     ** ** * * ** *   ** *   *     ***** ***  ** ** * 1;
    ******** * * ** **** **** * *****   ****   * *** *** *    * ** * ** 
*** *** ***          ***     * ***  **   * * *** *  *    *
* *  *    ** * *** * *   ** * *  * *   **  **    *  * ** if(p[i]!=s[i])
**** * **  ** ** **  ** **  **  ******** **** * ** 
  * * * * *  * ** **** ***   **   **   ** ** **** * ** ** *    *  * *** *   **  0;
  *  *** *   ** * ***  *  *    ** ***  *      * *** *
* **    *** * *     ** *
}


int main()
{
 ****  * **   *  
*  * **  * *** 
 ***  ***  *    ** ",p);
  **** ***  **    * **  
  *   * **** *  *  * * * *

sl=strlen(s);
pl=strlen(p);


*   ** *** * && pl<sl)
{

  * * ** *  *     **  ** **  **  ***      is a prefix of %s",p,s);
}else
{
printf("%s is not a prefix of %s",p,s);
}





}

Comments

Case 0: Correct output
Case 1: Wrong output
Case 2: Correct output

---

Case 0: Correct output
Case 1: Wrong output
Case 2: Correct output

---

Case 0: Correct output
Case 1: Correct output
Case 2: Correct output

Answer 4

Hidden content!
#include<stdio.h>
#include<string.h>
int main()
{
  *   **  *  * ***   **   *** *  *** a[99],b[99];
    int l,i;
  *** * *  **  *    **   *      ** *   
 **** * * ** *  * * *** *     *
 **  ** *** **  ** * **  *** * * * *** *
 *  * *       **  **   **** * * ***  ***    *
    {
*  ***** ** **      * * ** *  * ***   *   * *** ** **  ****   
 *  ***     ** * * **    ****  ** **** *    * * * **** 
  * **** *** *  **   ***    *** *** * ****  * * * ** * * ** **  ** * *    ** ** ****  **   a prefix of %s",a,b);
*  * *    ** *  *** ** *  *********    **** *  **   *   * *****    ***  ***   * ** *   *        * 
** *    *   ****  **   **  *  **  *** **  * *
**  * ***     **  *  *  *  ** * **** **    **** * * *  
 * ***   *   *    ****  * **   *   * * ****  ** *** * *** 
  *   ** ***    *  ***   * ***  *  *  *   **** * *** ***  * ****** *****   **   * *      **  *   ***   *   not a prefix of %s",a,b);
* *      **  ***   *   ***** *  **** * * **   ** * * ***  ** *   **  * **  *   * ** ** * * 
 ** ****** *   * *** *     ** *  *     *   ***** **  * *
    }


}

Comments

Case 0: Wrong output
Case 1: Wrong output
Case 2: Wrong output

---

Case 0: Wrong output
Case 1: Wrong output
Case 2: Wrong output

---

Case 0: Wrong output
Case 1: Wrong output
Case 2: Wrong output

Answer 5

Hidden content!
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>

int prefix(char a[100],char b[100]);


int prefix(char a[100],char b[100])
{
  *** *    *  ***  *** ***    i;
    **    * * ****          *   count=0;
* ***** *** **  *  *  *  * **  len;

* **  **  **  *   *  *  * ***   * ** *

   *       *    **  *   ** **** **   *   * * *   * *
  *  *     *  ****** *** * * 
 * ***** ***** *** * *********  * *******      *  * * * *  **       * 
** * **** ***      *   **   **   **  * ** * ** ** *  
 *** *   * *   * **** ** * ***   ** ** ****  ****      ** *** *    **     * **    *  *
**      **  *****   * * * * * **  *** ***   *** 
*  ** *   * ** *  *   *   * ***


* ***  **  * *** ****** *** *   * *
 **  *******  *****  * *****
** *** *     *  ** ** * **  *   ** *  *** *** *    * * * * 1;
** *  **  ***  * * **   **   * *
****  * *  * ***** * ** ****  **

   return 0;
}


int main()
{
* *      *** **  *   ** ***  * a[100];
 ** ** * *        *   **   **  b[100];


* *  *****  ** * *  ***  * * ** *    *** * * ** *****  *  *  
* ***     *    ** *  *******   *** * *  ****    * * * *  *  

 * **       ***  *  ** *****  **  ***
      **  *   * ****     **    ** *   *** 

*** * ** ** * * ** *  *  * **  *     **  

 {
** *  *  ***    *     *   * *   * **      * *  *   **  *  * *   *  *  ** is a prefix of %s",a,b);
  * *   * *  *  ** ***** 
  **    **  ** ****  *** * **
**  *  **   ** **  * *      *
*   * **  ******* * * **   *  *  ****   **   ** **     *  * ***  ** * is not a prefix of %s",a,b);
*   ******* * *   **  ******  **


* ***   *     ** * * *** ***     0;
}

Comments

prog.c: In function 'main':
prog.c:45:15: warning: format '%[^
   ' expects argument of type 'char *', but argument 2 has type 'char (*)[100]' [-Wformat=]
     scanf("%[^\n]*c%",&a);
               ^
prog.c:45:20: warning: spurious trailing '%' in format [-Wformat=]
     scanf("%[^\n]*c%",&a);
                    ^
prog.c:46:15: warning: format '%[^
   ' expects argument of type 'char *', but argument 2 has type 'char (*)[100]' [-Wformat=]
     scanf("%[^\n]*c%",&b);
               ^
prog.c:46:20: warning: spurious trailing '%' in format [-Wformat=]
     scanf("%[^\n]*c%",&b);
                    ^

---

Case 0: Wrong output
Case 1: Wrong output
Case 2: Wrong output

---

Case 0: Wrong output
Case 1: Wrong output
Case 2: Wrong output

Answer 6

Hidden content!
 ** * * **   ** *  *
 ****   *       *  * **

int  *  
{
** * **** * ****  **  *  *  * ***  ***  no idea, I * * even do it in the **** * ** ** 
 *  ***** *   ** *  ***  **  0;
}

Comments

Case 0: Wrong output
Case 1: Wrong output
Case 2: Wrong output

Answer 7

Hidden content!
#include   **  ***  * * * 
#include  ** **  ****  * *
#include ****      **

int pref(char[],char[]);

int main(){

**** ** *** * ***  * ***  ***  p[10],s[10];
* * **    *** * * ** **  * num;

** ****** ****  ******  ***  *
 *****   *     **** *  **  *** 
* * ** * ** *** ***** * *   * * * *** **** **   ** *  *
**  ** *** ****  **  *** **     * * *   ******  ** ***

******   * ***     **  ***  *  = pref(p,s);

 * **  *   * *    * **  ******  **
* *  ***** ** **    * ** ****  ** **     * *** * *    ******  is a prefix of %s",p,s);
 * ****    *    * **** * * *   
*   *  * ***   * * **   ***    *  * * ** **   **   **  ** ****** *** ***  ** * is not a prefix of %s",p,s);


 return 0;
}

int pref(char p[30],char s[30]){
** * ** ******  * *** *  i;

 ****    ** ** * *   * *    * **      *   *    *** ** **
 **    ***     **** **    *  *  ***  ** ** *  * ****   *** ** **    ** ***** ***** **  *  *  ** ** ** 
   * * * ** ***    ***    ** *   * *   * ** *  * *  * *  **  ****   *   ** *****     ***  ****   * ***  *   is a prefix of %s",p,s);
**   **       **** **  **  *** *** **    * ** *  *** *** *
 ** **   *     * ** * * **   *  * ** * * **** ** * ** *   ***   **** ****    *** *   ***   ** * * **   is not a prefix of %s",p,s);

   *     *   *  ***   **  * * 

}

Comments

prog.c: In function 'main':
prog.c:12:5: warning: 'gets' is deprecated [-Wdeprecated-declarations]
     gets(p);
     ^~~~
In file included from prog.c:1:0:
/usr/include/stdio.h:640:14: note: declared here
 extern char *gets (char *__s) __wur __attribute_deprecated__;
              ^~~~
prog.c:13:5: warning: 'gets' is deprecated [-Wdeprecated-declarations]
     gets(s);
     ^~~~
In file included from prog.c:1:0:
/usr/include/stdio.h:640:14: note: declared here
 extern char *gets (char *__s) __wur __attribute_deprecated__;
              ^~~~
/tmp/cc0tBG5r.o: In function `main':
prog.c:(.text+0x1f): warning: the `gets' function is dangerous and should not be used.

---

prog.c: In function 'main':
prog.c:10:13: error: stray '#' in program
     int num;#include <stdio.h>
             ^
prog.c:10:14: error: 'include' undeclared (first use in this function)
     int num;#include <stdio.h>
              ^~~~~~~
prog.c:10:14: note: each undeclared identifier is reported only once for each function it appears in
prog.c:10:23: error: 'stdio' undeclared (first use in this function)
     int num;#include <stdio.h>
                       ^~~~~
prog.c:14:1: error: expected expression before 'int'
 int pref(char[],char[]);
 ^~~
prog.c: In function 'main':
prog.c:23:13: warning: format '%s' expects argument of type 'char *', but argument 2 has type 'char (*)[10]' [-Wformat=]
     scanf("%s",&p);
             ^
prog.c:24:13: warning: format '%s' expects argument of type 'char *', but argument 2 has type 'char (*)[10]' [-Wformat=]
     scanf("%s",&s);
             ^
prog.c: In function 'main':
prog.c:51:5: warning: 'gets' is deprecated [-Wdeprecated-declarations]
     gets(p);
     ^~~~
In file included from prog.c:1:0:
/usr/include/stdio.h:640:14: note: declared here
 extern char *gets (char *__s) __wur __attribute_deprecated__;
              ^~~~
prog.c:52:5: warning: 'gets' is deprecated [-Wdeprecated-declarations]
     gets(s);
     ^~~~
In file included from prog.c:1:0:
/usr/include/stdio.h:640:14: note: declared here
 extern char *gets (char *__s) __wur __attribute_deprecated__;
              ^~~~

---

prog.c: In function 'main':
prog.c:14:13: warning: format '%s' expects argument of type 'char *', but argument 2 has type 'char (*)[10]' [-Wformat=]
     scanf("%s",&p);
             ^
prog.c:15:13: warning: format '%s' expects argument of type 'char *', but argument 2 has type 'char (*)[10]' [-Wformat=]
     scanf("%s",&s);
             ^

Answer 8

Hidden content!
* *   * * *    *
** **** * *   **   * 

int main()
{
* **    *  length1,     *  c;
*   *  a[100];
  ****   * ** b[100];
 **** **   d[100];

  *    * *** * * ***   * *  * * * 
  *   *     * *  ***  **  * ****    * * * *

  *        * *** **

  * * *     * *  * 

   *** **  * ***** *    
   * * 
  ***** ** **    ******  is a prefix of *  ** *** * 
**  ** 
**  ***  *  *  
  *   ***
 ***    *  *** ***** is not a prefix of  *  * * **
  ** ***

}

Comments

prog.c: In function 'main':
prog.c:11:10: warning: format '%s' expects argument of type 'char *', but argument 2 has type 'char (*)[100]' [-Wformat=]
  scanf("%s",&a);
          ^
prog.c:12:10: warning: format '%s' expects argument of type 'char *', but argument 2 has type 'char (*)[100]' [-Wformat=]
  scanf("%s",&b);
          ^
prog.c:24:11: warning: format '%s' expects a matching 'char *' argument [-Wformat=]
  printf("%s is not a prefix of %s,a,b");
           ^
prog.c:24:33: warning: format '%s' expects a matching 'char *' argument [-Wformat=]
  printf("%s is not a prefix of %s,a,b");
                                 ^

Answer 9

Hidden content!
  * *****   *      *
  *** * ***** * *   * 

int main()
{
* *    **  *     ** ****  * str;
** *   *  *        * * *   i, p, s;

*  * ****   * ** **   *     *  * ***  * * ** *    &p, &s);

  **  *      *  **  * ** **  (i<=0; &p; i++);
***  **    ****  **   *  * * **
 ** * * *  * **  * ***   *  ***    *  **    *  * ***  &p);
 **  ** ****  * *     * *** *      *   ****
* ***  ****   *   ***  * *** **
****  ** ******** * **  * **

   * *  **  *      ** ** *  * *    0;
}

Comments

prog.c: In function 'main':
prog.c:12:7: error: expected '(' before '{' token
     if{}
       ^
prog.c:13:12: warning: too many arguments for format [-Wformat-extra-args]
     printf("abc", &p);
            ^~~~~
prog.c:14:13: warning: format '%d' expects a matching 'int *' argument [-Wformat=]
     scanf("%d");
             ^

Answer 10

Hidden content!
 *** ** * * *      ** *
***** ***    ** ********
int main (){
char    **
char     *  * *
*** **  * ****  *  *  * * ******
** * **  ***    *   * ***   ***
  * ** ****    *  *  *  * * *   *
****  *  *  ****** *    ** ** *
* ** **   **    ***  ***
 ** **   ** * is a prefix of  * *   ****  * **  
}
else{
**  *    *  is not a prefix of %s   *  **  *   **  * * 
}
   * 0;
}

Comments

prog.c: In function 'main':
prog.c:7:9: warning: format '%s' expects argument of type 'char *', but argument 2 has type 'char (*)[100]' [-Wformat=]
 scanf("%s",&string1);
         ^
prog.c:9:9: warning: format '%s' expects argument of type 'char *', but argument 2 has type 'char (*)[100]' [-Wformat=]
 scanf("%s",&string2);
         ^