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];
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*** * *  ** ** *** ***   *  *  *  *    *  ***      * * * **      * *  ****** ** *  * * **   *** 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!
** * *   ***   *
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int main()
{
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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);
**  ******  ***       ** * *

** **    *      *   ****    **    *    *** {
* **  ** **    *** * ** **** *   ** ****  **  ****  ** * ****** {
*     * *  **  ***     ** *  ***  **   *  *** **  **  ** *  *  *  *  *  ** **  *  **  * *
*  * *****  *  *  **  ** *    **   *** *   **       * ** * **     **** *******
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   **  **** *    *  * *   
 *     ** * **   *  ** ****** {
   **** ****  ** ****     *** **** *  *  * ***** * * **  * **     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;
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* **  *  * * ****      ***   *  ****     *  *   *  *  **  * ** **** **  is not a prefix of %s",a,b);
    }
 * *  **     ****  * ****    *  *  if(l1<=l2){
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    ****   * *****    ******** *****  **  * * *******    ***   *** *
*   **  * *  *****  ** * *    ** ** *** * * ***         * * ****      * ** (a[i]!=b[i]){
   ** *** **  * *    **  *   *** * * **   ** ****    *   * * ** *****   *     * *  *     *  ** ****  * *    ******    is not a prefix of %s",a,b);
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 * **   *  ** **    **** *  ** *  **  ** * * ****** ** * **
    }
}

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