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

內容已隱藏
   **  *** ***  *   **
   ** *** *  ***** *

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

內容已隱藏
*    **  *     
***       ***    * ** *
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

內容已隱藏
 *   * *****  * *
***           *  *  ** * 

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

內容已隱藏
#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

內容已隱藏
#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

內容已隱藏
*   **  ** ****    **  ***
 **    *    * *  * ***

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

內容已隱藏
#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

內容已隱藏
 **  * ** *   ** *  *
 *   *****  **      ***

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

內容已隱藏
*****  *  *           
**** * * *  ***      *

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

內容已隱藏
* * **   **  *** * * ***
 *      *   **  *  *
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);
         ^