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);
         ^