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);
         ^