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);
         ^