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

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

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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***   *  *     * *** *     *    ** *    **** * * *  ** *  ** ***   *   ****** *** ***** *
* *  ***      **  **** ***  *    * * **  * *  *** **  * * **   ** *** * *** *** 
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*    ***** *  **      *   ** * *   *********** * *** * **  * ***** **** *** *    ***
* ***  *      *  *  *** *    ****   *  ** *** * * *   
 ** ** * *  * **  *    *  * **  ***   ***  * **  * *** * **  if(p[i]!=s[i])
 * * * *   **  *  ** ***   *   **** * * * *    * *** 
*   * *    *** **** * *  ***  *  ***** * ****  * **  *  ** **    **  *     0;
****    **  **** * **  *** ** **  *    * * *       ******
   **      **  * *** *   
}


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