1-11 Exercise 3: Prefix of a string

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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

 

[Exercise] Coding (C) - asked in Chapter 13: Strings by (12.1k points)
ID: 41439 - Available when: Unlimited - Due to: Unlimited
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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;
}
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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));
              ^
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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));
              ^
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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 * ****  **  

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


}
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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);
    }
}
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Case 0: Correct output
Case 1: Correct output
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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);
   ** ** **  ************ ** *     ***   *   *   * *  *
    }
}
answered by (-329 points)
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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);
               ^
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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);
               ^
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Case 0: Correct output
Case 1: Correct output
Case 2: Correct output
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0 0
-----------Re-judge-----------
Case 0: Correct output
Case 1: Correct output
Case 2: Correct output
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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;
}
answered
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0 0
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("");
            ^~
commented by (4.3k points)
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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("");
            ^~
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Case 0: Correct output
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Case 2: Correct output
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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;
}
answered by (-116 points)
0 0
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.
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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'
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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;
}
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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.
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Case 0: Wrong output
Case 1: Wrong output
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0 0
Case 0: Correct output
Case 1: Correct output
Case 2: Correct output
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0 0
-----------Re-judge-----------
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Case 1: Correct output
Case 2: Correct output
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