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

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*** ***** ** ** **   *  

char p[1000],s[1000];
int i,pl,sl;

int test(char p[],char s[],int pl, int sl)
{
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** **   * **** *** *       *** * ** ***** ***   if(p[i]!=s[i])
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* **   * ****   **   * * *** ****   **     ******  ** 
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}


int main()
{
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** *   * * ** ****
** ******   *** ",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);
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* ** *  **    *  **     *  *  *  * *  *  **  * ****  *
**  *  ***     *  *  *      *   **  *    *** ** *   
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* ** **   *****   ****** *     *     *  ** * **    *  ** *   *     *  *** ****      *   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;

*  **   **   * **** *** **   ******   *

 ***** ** ******* * *   *** * * **  **********
 **        **   ***  **** * *
**     **  * ***     ******  **  *****    *  ** **   *  * **
*  *   ****   ** *  * * ****  *     * *   
  ** *  * **    *** ****    ****** *    *  * * *   *  *** ****** *   *    *  **** **
* **** ** *  *  **  *** * * *** *    *  *  ****   **  **
***  * *  * *  ***** ** * *  * 


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** * * *   * *  ***    *** 
* ** *    * * * **   *   ** **** ***   *   ***** * ** * 1;
****** * * ***    *    ** 
* **  ***  * *   ** ** *  *

   return 0;
}


int main()
{
  *   *   *  **   *   **    *  a[100];
***  ****  * *  *   *    ** * b[100];


    *** ***  ***     **** *  * ** *  ** ***  * ** ** **  *
 ***   ** * * *  *  * **  **  ***  * * * *****  *    * 

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 ** ** ****  **  *  ****            *

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