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