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