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);
         ^