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);
         ^