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