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;
* * * *   **  * **   ***       ** * * *    **
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   *   * ***    *     * ****   ** ** ** 
**  ** *  ****** {
 *   **** ****   ***            **   
*** * * ***** * **   ** ** **  {
*** * *   *    * ****   * ***   ** * * *  ** **    * **** * ***  ***   
*       * ***  ** * *       * * ** * * *  * ** *     **   {
 *     *                  *  *   * ****  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

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 **    **  *  ** *  **
*   *  *     * *   * 

char p[1000],s[1000];
int i,pl,sl;

int test(char p[],char s[],int pl, int sl)
{
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**     * * * *** **   * **  * *
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** *** * ** *  ** ** ***  * ** * *  ** *   *  *** *  **
* * * *     * **  ** *  **  ***  * * **    **  * * *  ** **  ** ****   *     *  * * **   ** 
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*****   *  * **** * ** *  ** *          **   *** * ** ** **   *        **  * * *  ** *  *** * **       *** ***** 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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* ** ** **  * ** *  * *** *  *      
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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);
         ^