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!
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int main()
{
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  *  ***  * *  *  ** ** * **

** ****    ***   ** **
*** *** 
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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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* *****   * **     *  * **       **** * * ******  *  * ** *  ** *  * *  * 
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**  * ** ***    **     *
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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){
** * ** *   **  ***  * * **  * ***  *   **  ** *** **** prefix = 1;
* ** ** * *** *** ** *  ***  ** ** ******** **  * * ******  *  *****
* * * *** *  * * * ** * **********    **  ** * * *  *  *** * *    ** *  * * * ** (a[i]!=b[i]){
 ****  ***** * **   *  * * *   *   **     * *  *   **** **   *     * * **     **    * * *  * * ****    **  * * * *   * * *** * is not a prefix of %s",a,b);
* *    ******  **  **  *    *      **     *   ** ***  *** * ** *****  * ** **  *  ****  **     ** *  * ****  *****   = 0;
***  **   *   ** *  * ** *  *  * ** ** * **  ***** ***  *** *****   ***     ***** * **  *  * *** * *       * * 
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* *** * ** *****    * **   * *** *****  *********  * *  == 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