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