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);
         ^