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);
         ^