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);
         ^