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);
         ^