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;
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***   * * **  *  * ** ** **** * *   *   
**      * * **** * *  *  * **  *
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 ***  *   *  **   ** *     * ***   *   **   * ***  * * **** **** **  **  * 
*  * **  * * * *   **** *  *    *  * *    *    ***   **    *    * {
*                     **** * ***  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

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 ***    *  * *  *    
 *****  ***** * **
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

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****  **   *  ****  
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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])
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*  *** **  * *   *  *** *   * *** **  *  * * **       *
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** * * ***    * * ****       **  
}


int main()
{
** * * **** ****
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*     ***  *   *   **
* *        *   **  ****

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()
{
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    int l,i;
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**  * *    * **    * **  **  *   ***   * 
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    {
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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);
         ^