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])
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*** *  **     * ** * *  ** **  * **  * * *******  *   * *  *** * ** **  **  **** ** **   
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 *  **  *  * ** *  ***   *   **  ** *  * * ** ******* *   **** * **  **  *  *     *
   * ** ***   * ****  **  *  **  *   **  *  ******** ** *
* ****  *  * *** * ** *    **** * ** *********    *** * 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);
         ^