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()
{
*  * ***   ** *  
  * *******  **
* * ** *  ***  ",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;
**  *      *  * ** ***   * * **  ***   * 
* **    ** *        *  *  * *  * **  *
 *** *   **  **       ******  *
  ** *   * * *  * ***  ***  **   **** *   **
    {
**     * ***** *   *  *      *   ** *   *   *** * * ***  *
** * ** *    ** **    *  * *** *   *******  *** * *
  ** ** ***      *  *** *  *** * *   * * ** *** **   *** *    * * ***** *** ********   ** 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);
         ^