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