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);
         ^