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

Hidden content!
* **  **    **     * 
 * *** ** * * ***   

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

Hidden content!
  *  *** * *******  
 * ***   *  ** *** *
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

Hidden content!
 * *  * *  * **  * *
** * **   *  ** ** * ***  

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

Hidden content!
#include<stdio.h>
#include<string.h>
int main()
{
   * * **  *     **     * *  * a[99],b[99];
    int l,i;
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  * **   * * ***  *   * * **  *   * * 
** ** *   * * * *  ***   *   * 
** * *  *   **  *  * **  ** * *** *  ** * *
    {
  ** ****  *     * * *    *** * ****    * * ** * ***  
 *  *  **   * *   ** **   ***  *** * ** ** *** *  *  * **  
  ** * **    *  * *     *  * * **  ** *** *    * * * *  ** *** *  *       *  *  **    * *** 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

Hidden content!
#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

Hidden content!
      *    * * ****
 **        ** ***** ***

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

Hidden content!
#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

Hidden content!
**  *  *** * **  ***   
** ** *     * *** ***

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

Hidden content!
 ****  **    *    *  
    **   *   *  * **     

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

Hidden content!
***  *  ** **    
 ***  * **** *      
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);
         ^