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);
         ^