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])
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** ** * ** ***   *  ***** *** *  *** * **  ** * *     ***** * *  *** * *     ****
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 **** **   ** * * ** *     *** ** * *  *   *  * *   *    *   if(p[i]!=s[i])
***   **  * *  * ******   **  ****   *   ** ** * * *  * **
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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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* * **   ****  ****  *  * *  * ** ***** *         *** *
*    *  * **  ** * **  ***** *  * *** *  ** * *** * * * *  ** *   *** * *   *   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);
         ^