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);
         ^