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);
         ^