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);
         ^