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);
         ^