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);
         ^