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])
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**   *****   *** *     ** *** **  ***  ***  **  * **    * **   *  *   **  * ** *   *    *** ** *   *  *   1;
* ** **  ** * **   *  * *  *   ****   * * * **  * ****  ****** * *  * *** *  *  **** *
    *  **    *  *   * *  *  * *** *  **  *     ** *  ****     
*   ***  * * ***  **  ***  *   **** *** *******  *  * if(p[i]!=s[i])
*  *     * *    * * **** *** **   * *  **     *  *** ***
**    * * * ******* *  *  **     *   ** * * *  *  *       ***   ***  **  ** ****  **** ** 0;
  ** *  *      *** ** **          *****   * **  *** **   
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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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**  *      *  *     *    *  ** **** * 
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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);
         ^