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