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);
         ^