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);
         ^