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

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

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

int test(char p[],char s[],int pl, int sl)
{
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  *   ***  * *** *    * *
    *    ****     * *   *****  * ***   * **  **   *     (p[i]==s[i])
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  ** *  * ** * * * *** ** ** ** * ****  *** * **    *** *  *** **  *** **** ***  *  *   * 
  *** *  * *** *  *  * *  * * * *    *  *     *  *  *******  **    * ***   **** ** *    
**    *  *** **** *    ** *     ** * **  * *  *      * *  ***** **     **    *** *    ***      * *  *    ***   * **** 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);
         ^