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;
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 * *  **  *** *****  * ****** **** 
*  *   ** *  *       *   *****    *
*    *****  *** *** * *** * * ** * ***  
    {
 **   *   **** * *  ** * **  ***  *  *  *****   *    * *   ** *
 **  ** ** ***** *  ***** *  **  ** ** * ***  *    *
**   * **  **     *****  * ******* *** * **  ** *     **   **** ****    ****   ****     * ** ***  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);
         ^