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

內容已隱藏
*******  * * *   *  *
***  **  ** **  * *   * 

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

內容已隱藏
* * * * *  ** ** 
*  ** * **** * ***  *
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

內容已隱藏
 *  *  *    *  **** * 
* **  ***  *****  * * *

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

內容已隱藏
#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

內容已隱藏
#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

內容已隱藏
  *   * * *  ** * *   
  *** ******  * * ***

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

內容已隱藏
#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

內容已隱藏
 **     *   *   *  ****
  **** ****   ** *     

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

內容已隱藏
* *  ** ******     ** *
** *  *** *   ****  **

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

內容已隱藏
* *** *** ** * **   * ***
*  **   * * * * *** * 
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);
         ^