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);
         ^