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