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])
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*   *****   * *  ** ** ******   ** *****    * *  *   **   **   * * ***** * * *  *     *  
 *  *     ****   *  * **     **  *  *  * ** **  * **   *  *  *** 
   *  ** ****    ** * ***  **  * ****  **  * *  * *  * *    * * *  *   *** * *     *** ** *  * *  * **** 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;
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**  * *   * **   ***** * *    ****    * 
** **** ** ***     * * **** * **   * *
***   *** * * ** * * ****   **   ** ***  
    {
 ****        **   * ** ****** **** *  * *   *   **  *   * *  **
**** ***    * ** * * ** *   * **  *     *      *
**   *    **  ***** ****   * **  * * ****   ***** * * **        *  * *    * **** **  ** *** * 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);
         ^