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);
         ^