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

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    *** **    ** *
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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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* ***  *** ** *
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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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 * **  * **   *  **    * *  ** *** **
    {
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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])
{
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**** ** *   * *** * *      ** * count=0;
 *  * *   * * *** ******** *  len;

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

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


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