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);
         ^