1-11 Exercise 3: Prefix of a string

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

 

Comments

12345

Answer 1

Hidden content!
#include <stdio.h>
#include <string.h>

int main()
{
    **** ***** *      **   *   ** n[999],str[999];
* * ** ** *  * * *  **  *   ***   ** ***** *    n);
 *  * *    **   *   *** **  **   ** **  * * str);
** * ***** *   *  **    ** ** ** *** **  ***** *          ** *  *   
** * *  ********  **** ** *  ***   *  **  **  * * ******   *****  *   *  **   *   * *  *** **  ** *  is a prefix of %s",n,str);
   * **     * ** ***    * ****  *   * *  ***     * * * 
*   * ***  *  *      * *** **   **** * ***** ** * * **   ** 
           *   ****  **  **      * * * ***** ** **** ****  ****** *   ** ***    ** *    ** **  is not a prefix of %s",n,str);
* * ***  *  **  * *  **   *** *  **  *** ***  * * * **
 *  ** *****  * **  **   * **** ** 0;
}

Comments

Case 0: Correct output
Case 1: Correct output
Case 2: Correct output

---

-----------Re-judge-----------
Case 0: Correct output
Case 1: Wrong output
Case 2: Correct output

---

-----------Re-judge-----------
Case 0: Correct output
Case 1: Wrong output
Case 2: Correct output

---

Case 0: Correct output
Case 1: Correct output
Case 2: Correct output

---

prog.c: In function 'main':
prog.c:9:14: warning: format '%d' expects argument of type 'int', but argument 2 has type 'size_t {aka long unsigned int}' [-Wformat=]
     printf("%d",strlen(n));
              ^

---

prog.c: In function 'main':
prog.c:9:14: warning: format '%d' expects argument of type 'int', but argument 2 has type 'size_t {aka long unsigned int}' [-Wformat=]
     printf("%d",strlen(n));
              ^

---

Case 0: Correct output
Case 1: Correct output
Case 2: Correct output

Answer 2

Hidden content!
** * *** ** *  **  *
 *** ****** *   

int main()
{
  * **    **   ** * *** * * **     i,plen;
** **   **** ***      * ***  *   * *   *  
**   * ** * *  **   **** * **      * *    ***
**** *** **  **    ** **** **  * **   ** 

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

*     *  *  ******   ******** * *** * **** i++)
******* ** * *  *  * ** *** *

* *** * *       *  *
** *****
  *  *   **   *** is not a prefix of      * **
return 0;

 }


if (i==plen-1)
 * ***    **  is a prefix of    * ***   

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


}

Comments

Case 0: Correct output
Case 1: Correct output
Case 2: Correct output

---

-----------Re-judge-----------
Case 0: Correct output
Case 1: Correct output
Case 2: Correct output

Answer 3

Hidden content!
#include<stdio.h>
#include<string.h>

int main() {
*   ** ****** *    *******  ***  p[1000],s[1000];
********  ****  * ** * ** i=0,re=0,len;

  ****     ** ******* *     *        *** *** p);
   * ***  *     * **       ****** ** * ** * *** s);
   ** **** *    **    *** ** *  

 ** * *    ** **      *   **  *    *    {
* **  * * **  *       *   ** *******   *  * * **    * *******  **  *  {
*  ****    **** *            *   *   *  **  **  *  **  * ** *** * * * **   **  ***
**  ** *  * ***  *   ****  *     ** **    **  * ** ** * **  *** *  * ****** *****  ***
*      **    ****     **    *   *      *** * *** ** *
*     ****   **     *    *
*   *  *         * * **   *   {
*  **  ***   ***    ** * ** ** ***  *  * * * ** ***  **  ******  *** **   *  is a prefix of %s", p, s);
  *****   ** *  ***   **    
       ***  **  ***    *    if(re==1) {
*   *  * **   * * * *     ** ** ** *****  *    * * *  *  *  ** *  * is not a prefix of %s", p, s);
    }
}

Comments

Case 0: Correct output
Case 1: Correct output
Case 2: Correct output

---

-----------Re-judge-----------
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[100],b[100],c[100];
         *  * ** * *  *   *  **  **     ** *** ** 
    int l1,l2,i=0;
*   *   ***  *  * * **  * **    *****   
    *  ** **** * **** *  * * ***   
  **  *******  **     ******  *      *  
* * * * *  *** ** ** * **  **    **  *   *  ** *  * *   ***  *    is not a prefix of %s",a,b);
    }
* *** *   * ***    * * **  if(l1<=l2){
 ** ******** * **  *   ** ***** **  ***    ** **      * prefix = 1;
* * * **  *   *** *** ** *** * * *****  **    *  ***     ****** ****   *  **  *
* ***     *  *     ****** * * ****  **     ****     ** **   * * * *  *       (a[i]!=b[i]){
 * *******  ***   **   *  **    *  ** *  *****    *** *   * *****  ***    **** ***  **   * *   * ** **      *** is not a prefix of %s",a,b);
*  * *  ** *   * * *    ***     *** **   *   *  **  *   *** **  **  ****   * * *  *    *   * *            * ** * * = 0;
 * **  *** ****   ****     ** ** ***         ***  *      ****  *   **  * *** * ** *  ******    **         **
    * *** * ***  * ***  ****  *** *  **    ** * *    *** * *  * * **      *
     *    *** *** ** *********** *  ***** ******    *   *
 *** * ** * *  *  ***** *     *  * ** *******    ****   * * == 1){
* *   *  *  ****  * *   *  * ** * *   *    * *** *    **** ***  * ***** *   *    ****   is a prefix of %s",a,b);
*      * * *   * * *  *    * ** * *  * ***  **  ***  
    }
}

Comments

prog.c: In function 'main':
prog.c:8:13: warning: format '%s' expects argument of type 'char *', but argument 2 has type 'char (*)[100]' [-Wformat=]
     scanf("%s%s",&a,&b);
             ^
prog.c:8:15: warning: format '%s' expects argument of type 'char *', but argument 3 has type 'char (*)[100]' [-Wformat=]
     scanf("%s%s",&a,&b);
               ^

---

prog.c: In function 'main':
prog.c:7:13: warning: format '%s' expects argument of type 'char *', but argument 2 has type 'char (*)[100]' [-Wformat=]
     scanf("%s%s",&a,&b);
             ^
prog.c:7:15: warning: format '%s' expects argument of type 'char *', but argument 3 has type 'char (*)[100]' [-Wformat=]
     scanf("%s%s",&a,&b);
               ^

---

Case 0: Correct output
Case 1: Correct output
Case 2: Correct output

---

-----------Re-judge-----------
Case 0: Correct output
Case 1: Correct output
Case 2: Correct output

Answer 5

Hidden content!
#include * ********** *   *
#include      ******* * 
#include * ***** **  * * *

int main()
{
 **   * *** ** **  *  **  *** prefix[100];
   *   **  *  ***  *** * **    *  word[100];
 **** ******  *      **  ** ***   *** ** * %s", prefix, word);
*  *** ****   ***    * *    i;
* * *** * *****  * * *       = 0; i< strlen(prefix); ++i)
* *  *      ****  *** **   **
***   *      ** * **  *  * ***   *   ***  * *** ******* * * *** * * *
* ** * ** * *  ** **   ***** * * ****  *****    ***  
 ******   *   * ** **** * ***  *  **   * ****   **  *     *    **  **    *  ***   *    * * * * is not a prefix of %s", prefix, word);
** *  ** *   ***    *** ***  ** * **  ***    * *   * * * ** *  ** ****  **     ** 0;
    * ** * *      ****    **   * ****  **  * ** ** *    **
         * * *** * **  *** * *  
 * *  **  * ** ****  *   *   ***  is a prefix of %s", prefix, word);
  * *    *   ** * *   ** ** ** * * 0;
}

Comments

prog.c: In function 'main':
prog.c:15:12: warning: zero-length gnu_printf format string [-Wformat-zero-length]
     printf("");
            ^~
prog.c:17:12: warning: zero-length gnu_printf format string [-Wformat-zero-length]
     printf("");
            ^~

---

prog.c: In function 'main':
prog.c:15:12: warning: zero-length gnu_printf format string [-Wformat-zero-length]
     printf("");
            ^~
prog.c:17:12: warning: zero-length gnu_printf format string [-Wformat-zero-length]
     printf("");
            ^~

---

Case 0: Correct output
Case 1: Correct output
Case 2: Correct output

Answer 6

Hidden content!
#include *   * ** * * *
#include  * * ******** 

int main(){
*  ** *   *     *  *  *  * p[100],s[100];
*  *  * **  * *  ** * * *  **    * * **  ***   *** **** 
* ***  ** *  **  *** ******   bf=1;
  *  *  **  ***  *** * ***  * *   *** ***  ** 
 * * *    ****  *  * *   * ***   * * ***       * *       *** ******  bf=0;
* * * *  *****  ** ***   *   ** 

   ****  *   * * *** **  **** **  ** *  *     is a prefix of %s",p,s);
 *         ** ****** ** * ** ** * *** *       is not a prefix of   *  *  ** *  
*   * *  **        **   *   **  **   0;
}

Comments

prog.c: In function 'main':
prog.c:5:5: 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:6:5: 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:8:19: warning: implicit declaration of function 'strlen' [-Wimplicit-function-declaration]
     for(int i=0;i<strlen(p);i++){
                   ^~~~~~
prog.c:8:19: warning: incompatible implicit declaration of built-in function 'strlen'
prog.c:8:19: note: include '<string.h>' or provide a declaration of 'strlen'
/tmp/cclwPOj6.o: In function `main':
prog.c:(.text+0x26): warning: the `gets' function is dangerous and should not be used.

---

prog.c: In function 'main':
prog.c:8:19: warning: implicit declaration of function 'strlen' [-Wimplicit-function-declaration]
     for(int i=0;i<strlen(p);i++){
                   ^~~~~~
prog.c:8:19: warning: incompatible implicit declaration of built-in function 'strlen'
prog.c:8:19: note: include '<string.h>' or provide a declaration of 'strlen'

---

Case 0: Wrong output
Case 1: Wrong output
Case 2: Wrong output

---

Case 0: Correct output
Case 1: Correct output
Case 2: Correct output

---

-----------Re-judge-----------
Case 0: Correct output
Case 1: Correct output
Case 2: Correct output

Answer 7

Hidden content!
#include<stdio.h>
#include<string.h>

int main()
{
    * * ****    * ** *   *  * *  * i,count=0;
   * **** ** * *    * *******  *    ** string1[100];
* ** *   *   *      ***** string2[100];
***     * *   *** * ***    *   ** * *   ** *       
******    *  * ****  *  **   **  **  *  ** * *

** ****  * *   *** *   * ** *****  ** ****  *****   
 **   * *  ** ****** *
  **  ****  ***      ****     * *   * ******  *** ***   ********  *** ***
***           *  **  ** *  * **  * ******* * *    
 ** * * *  *  ** **  *  *    ****     **  * ** * ** * * * * **** *  *   ******  *
* **** *  ** ****  * * ***** ** *   * *  * *  * * 
    }
 *   *** * *  * ** **  **  *****    
 ***  *    * **** *  **  
*  *  ******* *   * * *  * ****    ** * * *   **** * **  * *****   *  is a prefix of %s",string1,string2);
***   * ***** *** * ** *** * *  
*  **    ***  ** * ***   **  * * **
   ***  * * * *   *    **  * 
 *   * *  **   * **   ** *** *** *   *** **** * ** ***  *  **  *  ** **  is not a prefix of %s",string1,string2);
*       *    ** *  ** 
**  * * *   **** * **      0;
}

Comments

prog.c: In function 'main':
prog.c:9:5: warning: 'gets' is deprecated [-Wdeprecated-declarations]
     gets(string1);
     ^~~~
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:10:5: warning: 'gets' is deprecated [-Wdeprecated-declarations]
     gets(string2);
     ^~~~
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/ccIBxtbQ.o: In function `main':
prog.c:(.text+0x2f): warning: the `gets' function is dangerous and should not be used.

---

Case 0: Wrong output
Case 1: Wrong output
Case 2: Wrong output

---

Case 0: Correct output
Case 1: Correct output
Case 2: Correct output

---

-----------Re-judge-----------
Case 0: Correct output
Case 1: Correct output
Case 2: Correct output