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);
         ^