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);
         ^