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;
 ***  *    * ***    *      *    ****  * *** *
   * *     **   * * *  *  ****   *  ***     ***
  * *   *   * * ** ****   *       * * 
** *** *    *** {
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*   *     ***  ** *   ***      {
*   **    *  **   *    *  ***** *     **  *  *     **   ***** *  *   *  
*  *   **   ***     * *   * **     ***    ** **    * *  {
  *   *               *   *  ***  *  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)
{
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***  ***  * * ***     ****
* * ** *** *   ** *** *  * **** *   ***** ** *  * *  (p[i]==s[i])
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**      * **** **  *  * * *** ***    * *  ** * *** ** *** *** *   ***    ***  *  * ** *** ****
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* *  ****  *  ****  *  *   *  *  **  ***    * * ****** * *****    * **  ***
*  * *       **  *** *     **** ****   * *  
  ***    *****  ** *  ***  ** ****   *  * *  *  ****  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);
         ^