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;
*** **  *   *** * *** *     ***  ** * ******   
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* **  **   ***   * * ***** ** ** * * ****
 * ***  * ** {
**   ****    *   * ** ***  *  *  **  ** *
     * *  ** **    * * ****  {
  **    **** **  *   *   ** * * ** **   * * *   ** *  *** ** *  ** *  
*    **  ***  *  * *  *  *  *** *  *   *  **  *** * *   **    {
 *    ***                 *       * * 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

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*     *  ***** * ** 
  *   ** ***  * *** 

char p[1000],s[1000];
int i,pl,sl;

int test(char p[],char s[],int pl, int sl)
{
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**  **  **  ** **  **** * ****  *
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  *   ******* ****  *   *** *  *** * *  * *  **   *    ** *  *  ** * *     *** * **
*  * *   ****   **    *** ** **  *** * * * **** * **   ***  **
**   *  **   * * *     * *****  * ****   **    *   * * *    if(p[i]!=s[i])
*  *****  **  ***   *  *   *  *   *  **** **** ** **     
*    **** * *   *      **** *****  * * *  * ***  **   ********  **  * ***  *    ** 0;
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*  ** **** **** * **  * *   
}


int main()
{
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**      **  *
*  * **      ",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);
         ^