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