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()
{
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*  * * * * *  **  **
***** **
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return 0;

 }


if (i==plen-1)
*  * ** *   ** * is a prefix of  ** *    ** 

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


}
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Case 0: Correct output
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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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**  *  **** * ** *** * ***   *
***    *  * ***** * * *  ******    {
*** *  *  *  * **    *   ** ** **    ***  **  * ** *     ***** 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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Case 0: 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;
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* * *  ** * ******   * *    * ** *   **
*****  ****       *** *****     *******   
*   ** *  ** ** **** *  *** * * ****  ***   *  *  * ***** **  **    is not a prefix of %s",a,b);
    }
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 *  *      *  ******* * * ***  ***   ****** *   * **    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);
   ** ***  **    ** *    * ** ***  *  * ** * *   *
    }
}
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);
               ^
commented by (4.3k points)
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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
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0 0
-----------Re-judge-----------
Case 0: Correct output
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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("");
            ^~
commented by (4.3k points)
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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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Case 0: Correct output
Case 1: Correct output
Case 2: Correct output
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-----------Re-judge-----------
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