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);
         ^