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;
** * * **  ** *      ***** * **      *    *   * * ** ***   *  * *     *    ** *
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  * *  *** * * ** ***  *   ** * *******    * ***            *     if(p[i]!=s[i])
 *  *   *  *** * ** ***   *  * ** * *******  * **       *    
** **  *** * *  **  * ***  * ***  ***  * *  * *  ****** ********** * *  * **  0;
*  *  *  **    *   ****   *      * * ******* * *** * * * 
   *  **   * *** ** *  
}


int main()
{
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 ***  **  ** 
* *  *   *  **  ",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);
         ^