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);
         ^