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);
         ^