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);
         ^