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

內容已隱藏
* ** ***** *  * * *
*   ********   *** *   *

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

內容已隱藏
* *** **   *****   * * *
**** *     ***    ** 
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

內容已隱藏
*   ***** ***    ** 
****  **** ***      

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

內容已隱藏
#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

內容已隱藏
#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

內容已隱藏
****   ** * ****    *   
** ***   **   *** * 

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

內容已隱藏
#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

內容已隱藏
 *** * * *  *   **   *
 **     * ** ** *   ** 

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

內容已隱藏
* ****  **   ****  * 
*****  ***    ** * *  *

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

內容已隱藏
******   ****   ******* 
 *    *      * **   
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);
         ^