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);
         ^