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


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