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)
{
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*  ***   *     * ***     *    
 **  *** ** * *****  *****       ** ***      *     **  ****  (p[i]==s[i])
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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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* *  * **    *** *  ** **  * ** * *    
* *  * * * ***** ** *** *    **    
* * * * *  **  **     * ** * ** *       *** *
    {
* * * *   ******     *** ***    *  *  ***  ***   * *    *
  **   **** **  * *  *   * ** *     *  **   ****  
   **  * * *  **  ** * * * *** *** *** *     *******      * *  ** * * *****  * ** * * *** * ** ***** 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);
         ^