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()
{
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*   * ** *   *
*  * *      *    ",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;
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**     ***   *****  **  *   *****        *
*   * * *** *****  **  *   ** **** *  
**    ** *** * *   * **  *    *** *** 
    {
*** *** *  *****   ****  * *  *     ** *  ***** ***** 
 * ** ****     *     *  **         *  * ***  ***  *  * * 
   *  ****** **   **  *   *  *  * * *  ** **   *  * *       ** ** ******   * *   ** *   *  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);
         ^