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])
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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);
         ^