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);
         ^