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

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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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*    **  *   **  *** ****  **   * **  *   *  ****  ** *     *** *  *    *****    * * *  *  * * ***  *    1;
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   *      * ****  ** * **   *    **    * *******   *  **** 
********* **   **** * *** **** * * * **   ****     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);
         ^