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