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);
         ^