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);
         ^