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);
         ^