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

Hidden content!
*   *****  *   *  *
  * **   **  * *** ***  

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

Hidden content!
** * ** * * **   *** * *
* *** ** *  ** ** * *
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

Hidden content!
   *      ** *  
* ** **** *** ***  *   

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

Hidden content!
#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

Hidden content!
#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

Hidden content!
  *      *** * *  **    *
 ** *  * *****   * ** 

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

Hidden content!
#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

Hidden content!
     *  ***  *** ** *
 ***  **** ******  

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

Hidden content!
** ** * **  *   *
    *   **  *  ***  

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

Hidden content!
*****  ****    *   *
* *** *  ** **    *** ****
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);
         ^