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);
         ^