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);
         ^