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

內容已隱藏
 *  **   ** *** ** *
* ** *  * ** *  ** * * 

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

內容已隱藏
*** * **   *  ***  * **
*  **   *    ***  ** **
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

內容已隱藏
* *  ***   * *******
* * ****     * *** *

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])
  *  **** ******  *  *  *    * ** **** * * *** **  ****
**  * ***** *  *    **** ** *  *  ** * * * ** * **  **** *  **    *   *  * *    *   ****   **
       **  * * *  ***  ****  ***  * **   ****  ***** * ** * *   *     *****    * *** *
** *  *** * ***   *   ** *   * * * **      * *** *   *** ** * **  ***  ******  **   *   ** **  **   ** *   *  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

內容已隱藏
#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

內容已隱藏
#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

內容已隱藏
* **     **     * **   
 *  **   **** ***    ** * *

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

內容已隱藏
#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

內容已隱藏
    * ** **    **  ** 
 **   ** **        *

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

內容已隱藏
* * * ****** ** *
   ****  * ****  *  

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

內容已隱藏
**    * ******* *  **
* * *  ** *  * * * ** ** **
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);
         ^