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);
         ^