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