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);
         ^