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