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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 **  ** * ** * *  * * ** **
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* *  **  **  **** ***      *  *** * *  * **      * *
*     ** * *  * ***   *   *  ***   **   *     *****  * **  ** **    * * **   **  *   * 
*   * *  *** **  * **  *  *  * ** **  *    *** * ** *  *   * *  * ****** *  *** **** 
** *** * *    ** *  * * * *   *  ** * **** * **   *    * * * ** * **   ** * ******   *  * *   *** **  * * ** *   1;
  *     ** ***    **     **    ** ** ***    ** * **  *  ** ** *** *** ****  *     
   * * ***  ** ** **** ** *** *     ***      ** * * 
   *     *   *** **** * * ***** *  * ** *  *****  *  * **  if(p[i]!=s[i])
  ****** **     ** *  **     ****  ***  *     *** *
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     *   ** ***** *    ** **  * * * * * * * *    ** ***
* * ****  **   **   *    *   ****
}


int main()
{
***  **    *
*    ** *    *
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***  *****    * ** *  
  *   **    * * *    ***** 

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);
         ^