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

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**   *  **   ** * 
 * ***   ** **  *   **

char p[1000],s[1000];
int i,pl,sl;

int test(char p[],char s[],int pl, int sl)
{
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*   ** * ** ** *** *  * **  *
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**** ** ** * * *  ** * **    *  *   **  ***  ***** * ***** **   *  **        * **   **    * * ** **   * ***  ** * 1;
*   ******    *** ** *     * **** ** * * *  ** ** **  * *** * *  ***  ***
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 * ** *  ** *      ** * *  *   *   **** *******    * ** if(p[i]!=s[i])
*   *** *  * *  *** **   **   ****   ***** * *  **  **** * *
*       *** ***     *  ** ***  * * **  *   *    ** **** * *  **  * *  **     *  ** *  0;
* *   ***  **  *** **    *******   ** * * **       
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}


int main()
{
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****      ** *   *    **   
* *  *  * *   *** * 

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);
         ^