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);
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     **  *  * *   ** **    * * *  *   **   *        **  *  
 *      * * *  * *      ** * *  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!
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int main()
{
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return 0;

 }


if (i==plen-1)
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    * ** ***  ***      *** *  *


}
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Hidden content!
#include<stdio.h>
#include<string.h>

int main() {
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  * *  *     ****** *** ** * i=0,re=0,len;

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    }
}
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Case 0: Correct output
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Hidden content!
#include<stdio.h>
#include<string.h>
int main()
{

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    }
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*** *** **** **     * *  * *  *  * * **  ** * **  * *
    }
}
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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);
               ^
commented by (4.3k points)
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Case 1: Correct output
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0 0
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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;
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*** **    * *  *  **   **     * 
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**  ** **      ** **   ***   *  *  *****  ** ** ** * *      * * * ** **** * *   * * * 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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Hidden content!
#include **   *    *   *
#include   ***** *******   

int main(){
  *****  **   * *   * ******    p[100],s[100];
   ***   *     ******* * *  ****   **  *  **  *  *  *  
  ** ***   *      ****   bf=1;
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* * **   *  ** ** *    * **     ** * ****** ** *  * * ** **** * 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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