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);
         ^