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