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);
         ^