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;
*  *  * **** *** ** **** *     ***** ** *
*  * *  * **   **  *  * * *  *   ***  
    *      * *****  *  * *** ** * * **
 * * *** ** **  ***** *      * * ***  **    *** *
    {
  **  *** * *****   ***  **  ** *    **   ***  ** * * * ******* 
* *     **  ***** **  ***  *       *  * ***    * 
* ** ***   *  ** * **   *  *  * *  *  * * * ******* * ****    *  **  *   *   ** * * ***      **** * 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);
         ^