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);
         ^