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);
         ^