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);
         ^