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);
         ^