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);
         ^