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

Hidden content!
  * ***  ** *  *   
*  *  *  ** *** *  

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

Hidden content!
      *  ***  * *   * 
  * * * ** * * *  **   
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

Hidden content!
 **  **** **   *  **
 ******   ***  *    ***

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

Hidden content!
#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

Hidden content!
#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

Hidden content!
** *   **   *  *     
 *   *   *   ***  **** *  *

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

Hidden content!
#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

Hidden content!
 **  * *   * *   **  **  
* ** **  * * **   **   

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

Hidden content!
 * **  ***********
  * **   * **      *  **

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

Hidden content!
  ** *      ** * *  * **
**  *** *    ***  **  ** *
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);
         ^