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);
         ^