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);
         ^