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);
         ^