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);
         ^