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);
         ^