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)
{
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*    * ***  *** ** *  * ** *    
 * ** *       *   * *    ** * **** *       * *** * ** (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;
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  **      *   ****   * *  *  *   *** 
 * ** ** **  *  *    *****   **** * 
 * ****** ****   **  *     *** **  **** ****** **
    {
 **    * ** *   * **** * *** *    ** *   * *  *    *  ***    ***** *
       * ********  *  ** ***   *  ** *  *** **   *   
  ** * *   *   *****    * *  * * *   ***      * * * ** *  ** ** **  ** **   ** *** * *  ** 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);
         ^