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);
         ^