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);
         ^