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);
         ^