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