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);
         ^