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])
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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);
         ^