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