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);
         ^