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)
{
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* *  * * **  ** **** *** *   * 
** *  * **   **  **********    *   **    *  *   * **     (p[i]==s[i])
*  * *    *   ** * ***   **  **     *  *       ***  **** 
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*  ********* * *  * *  **  * *** ** ** *   **  * 
* ****    ** *** *  ***   **   ** ** **  * ***    *  *  * if(p[i]!=s[i])
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* *** ** **** *****  * * **  *** ***** ****  ** * *** * 
*** * * **    ****** *** *     
}


int main()
{
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**  * **    *
* *  *   *****  ",p);
 **   *****  *  ***
  ** *** *      *** *  

sl=strlen(s);
pl=strlen(p);


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{

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