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);
         ^