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);
         ^