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)
{
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**  *   *** ***  * *  *  * *** *
** ****  *    **  *       * * * *     * * *  **  *     *** (p[i]==s[i])
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 **  *** ** ** **  *** ** * ** *********** *   *  **  **    ** *** * *   *
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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);


 * ** **  *     && 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);
*   * *       *** * * **  * *   * **** * **       * ***  *    **  **    *  *  ***** **  **     
 *     *****  * *****   ****   *  * **  * * ***   ***  * *
* *   ******* *    ** ** ** **** * *  * **  * **   * 
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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;

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

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


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