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

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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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  ** **   *  ***** ** **   *  **
* **** *  * *   *  *** **** * *  *    ** ****  ****    ***  * * (p[i]==s[i])
*  ******* ****  * **  *   *** *  *      * **    ****
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 * ***  ** *** * * ******   ** *   * *   ****    * *  **** *   ***  *  * ** **  * 
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**  **** **     *** ****  *   * *  ** ** *** *  * * *****  *  *****  ** *** ***
*  *  **   * ** * * * *    *  *   *******  *  **** * * * *
* *    * ***  * **    * *  *    **    * *   ** ****  if(p[i]!=s[i])
 ** *   * * **    ***        *  * *  *    * * ** **
**  *  * ** *  * **** * * * * * *  *****    **** ****  ***   ****  **   *  ****    **    0;
     ** **  ** ****   *  *********    ** **     **** ** 
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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);
*** *  *** ** *  *    ** * **  * ** * **   * **   * ** **   ** **  *** * * * ** * 
* **** ** ** **   **     *  ****   **** * *   *  *
*  * ***  *  * * ** *     ***    *    * *     * *    
* * *  ****  ***** *  *  *  ***    * **  **    **   *  
** * * ***   ** *** * * *******     **** **        * ** *   *** ** *  **** * *   **      * *** * **   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);
         ^