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