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);
         ^