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);
         ^