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);
         ^