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;
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* ***  ******** *         *   ***** * *  ******
**    **   *   **    **  *   * ** ** *   ***   *  

*      * *** *** ***   **    *     *  *

*  *  ** ******** *       **  * *   * **  **** * 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;
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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;
    * ** * *   *   *** **    * *   **** ***    **   ***** * ***  **  *  * *** * *   * ***   *     
*****        ***   **** * **    *         * *** * **   *  *    *     **   *** ***  ***
*      **  *** * **  * ***   *   **   * *** * *  ****  *
     ***** * *  **** *  ****   ******  ** * *  * *  *** * ***  == 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