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;
*   * *   **     *  *     * ** *****  ****  
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**       *      *    **   ** ******    *    **
*    *   ** ** {
  ** ** ***   * ** **  ** ***
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 * ***  ***   *** *** ** *  *   **  *  **   *    *  * *     *   ** * **  
**** *    ***** ***   ***    * ****  * ***  * *    *   *    {
 ** * * *                 ** ***   *****   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;
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* *  ** * *   *  *    * * **  **  *** **** * * *     
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* *** *   *  *****  *   *   **  ***    **  **  *** **  
**  * * **** *     * **  * *  *
}


int main()
{
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    * **    ***  ***
* *   *   * * **** * 

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;
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*   * ***  ****** ***     **  ** 
* * *  * *   *       *    * *  **
** ** * **   *****  ***  *   * **  *  * 
    {
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* ** * ** ***  *   *  *** **** *  *  * ** *  * * ** **   * *
* ** * *   *** *       *    * **** *   *    **   **   *  * * * **** *** ****       * *   *  *** ** a prefix of %s",a,b);
* * ******* *   ******* **   **** *   * *  * *         ****   ** * **  ** ***** * **
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* *   *** *     * *   * * ** ** *  **** * * *  *** * *** *   * ***** *  * **   * ****   * ** ***  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;

**   *     **   *    ***  * *   **   *** *

 *  *  **  * * *  * *** * **   ***** *  *
*   ** *  * * *   * *  * *  
* *   * **  * * *  **  * * *    **** *   ** *  *  **   *  
 * *** *  *  *    *   ** *    ****   * **  * *  * * 
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   * *  **   * * *  *   *  ***** **  **   *** ** ****
**  *   *  ** **** **  * * *


 * * * ** *      ** *  *   ***  **
  *     *  ** *      * **
  * *      ** * *  ** *       **** ** * **** *  ***   * * ** 1;
* * *    **  * **  *** *  * *
** *** *  *  * **  * *****    

   return 0;
}


int main()
{
*  * *   *  *  * *** *** **  a[100];
**   * ***   ** *** *** *  * * * b[100];


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**    *** * * * *** ** **       **   * **** **  **  *  **  *  *

* *   *** *  *** ***   ** *   *  * *
***  **  * ****  ** ** **     * ** * 

* * **  **       **  ** ****  * **  * 

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