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);
         ^