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