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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    *    *   *     * * ** *** *  ****** 
 **    **** ******   * * * *  
* * **** ****   {
*** ***   ** **   *****  * * *  *  *  *
 ** *  *   * *  *  *   * * {
  *  ** *  *   **  * ***  **   * * * ** * ** * ** **     ** * *  ***  * **  
 *   ** **  *** ****    *      ** ** *** **** ****   *  **  {
*  * **                ***  *      *   ** 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!
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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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* ** *   **** *** **  **  ** *** ** *  ** *** *    ** *   *   ** *      * ******** 
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**  *  * **     *  * ** ***  ** *   ** **    *  **   *  *  *   **   *   ***** *** * ***
 *  * * **  **   *        * *   * ** **  ** ****   ****
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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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    {
**    *** ****  * ** **  * **** **   ** ***** *   *  * *** *      *
 *    **  *   *****  *** * *  * **    **   *  *   * *
*   * ** *   ***   *  * ******* *     **    *** *  * **   **     **  ***   * ****     **   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;

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

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


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