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);
         ^