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)
{
**** * *  **** * * **    *****  i<pl; i++)
* ** * * ** *  *  * * ***  * * **
*  ** *   **  * *  *********   ***   *** * ****      * ** (p[i]==s[i])
  ** *  * **  **  *** * * *      ** * ***  *    ** **
* **    *** * *   *******  *   ** **  *  *** * **   **  * *  *   * *     * *** ** *      *
******   *  ***    ***  * ** ***** *  ** *  * * * **      ****   *  **   *  **** * *    
 **** *    *****  *   *    ****** * *      ***    **  **  **  ***    ** *    **       ** * * *** *  * 1;
   ** **** ** *  **   *  * * *  *  *       **   * ***  ** *  * *  ** **  *** *****  
*   *** *  ***    ****   ***  **  * * * * *    **** 
 *  * ***  * *  * *** * *   ****   *     * *  **   * * 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);
         ^