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])
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 ****  * *** ******* *******  *** ***** *** *   **  **   *    * *** *   ******  
*** ****      *** ***     **  **  *** *     *   *   *  *** ** *   **** ***** ***  **  **** *   **      * * *  *** 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;
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** *       ** **** ******* *     ***** 
** *   *  *  * ***** *   **   *
* ****  *    *  *   **  ** ** *** ***  ****  
    {
 ** ** ***** ** * ** * ** *   **   * * **  * * *  * *   *  *****     
    * **    **  ** *    * *    ** ** ***    ** * * * *
** ***  * ***** *** * * ** *** *** * * *     *  *  ** * **  *    *****     * * * *  *     *******   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);
         ^