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);
         ^