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);
         ^