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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** ** *     *  *    **   ** **** *** * *  **
 ** * **  **** **  *** * * **  * *****
* *** * ** *  * {
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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

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