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);
         ^