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

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  **** ** **    ****  *
******     *** ** *    

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;
  * ** ****   ***  **  **  * ** *  **    ** *  ** *  *  * *    * **** * **** *   **    **
  ***  *           * * * ****  ** * * *   *  *** **  * *  *
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  *****    * *   *      **   *   *** *  *  * * *** **  
**   *** *****  * ***  *******  ***  ***  *    * *     * ** *  ** **** ***  ****  *****  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;
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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);
         ^