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);
         ^