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);
         ^