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