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);
         ^