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;
**   **     *  * ** ***  *   *  **   *****
       *   *   ** ** * **** **    **
**  * ***  ***  *   *   *  **  *   **
    ********  *  ** **     *   * *   **  * 
    {
 *** * **    * * **   **  **** *    ** * *  **    ** * * * ** **  
** * *   * **  **    **  *  ** *    *  *** *  **    
 *  *  ***  ** * ** **   ****  *   *****      *  * **   **   *  **  * * * *** * **   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);
         ^