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

Hidden content!
#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

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);
         ^