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);
         ^