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)
{
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* *   * **  *    *** *  * 
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****** *      * *    * * ** ***   * **   ***    **  **********   *   *  * ******* 
**** ***  **  * ****  ** *  **     **** ***  ***   *  * *  *  **  **  *     *** ****     *    * ** *** 1;
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* ** ** **   ** ****** ***  *  *  **   * *  **  * *** *  
******* ** *  **** *  **  ***      **    ** * * ** ** ** *   if(p[i]!=s[i])
**   ******      **** **    **** *  *  ** *   *      * 
*    * ** **    ** *** *  **    **** *    ** * *     *** * **       *   *     ****** *  ** 0;
* **** **** * *** **  *   *** *  **  *   *   **    
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}


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