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()
{
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 *  * * *    ***
 **     ******  ",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);
         ^