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);
         ^