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