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);
* ** ***     ** **  ** ***  *   **  ***   *** ** **  
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**   ** * ****  * *   *   * **   * ** *****   *   * *  ** * * ***    **  * **  *   *     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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*    *** * * **
*    * *  
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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);
  *        *** *** *      *   * *** **

* * *    **  *   * * * *   ** ** *      {
   **  ** * ******  *   *  * ** ***  * **  *   *   * ** * ** ****  {
  ** **  ****  *   * * *  *  * *** * ** ** ** * ** ** *  * **   *    **   ** ** **     ** *
 * * ***    **   **   *  * **   *** *** * **    *** ***   * *** ** *  *    ** **  * 
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* **** * *   ***   ***  * *** 
* ** **   *** *  **  *    *     *  {
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  * **  * ***  **  ** ** 
*  ** *  **   *    *    *   if(re==1) {
     *  **     ** * ** *** ***     ***** ****   * **** ***    ** ***   is not a prefix of %s", p, s);
    }
}
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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;
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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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*  *  ** *  *** **** * * * *   ** *   * * ****** *****   * *   *  *  *  ******   *  *  *   * * * *  * 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
edited by
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)
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("");
            ^~
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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: Correct output
Case 1: Correct output
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