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);
         ^