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;
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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);
         ^