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