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);
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    *    *** *  *   *   ***   * ***  ***  **  *     **  ** * *** * *  ******   ** *    **** **  is a prefix of %s",n,str);
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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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Case 1: Correct output
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Hidden content!
 *  ** *  **** *   ** 
  ****   ** * *** * ** *

int main()
{
    *  **  * * * ***   **  * * i,plen;
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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() {
 ** **  *  ****   * *   p[1000],s[1000];
** *   **  * ***  * **  **  i=0,re=0,len;

 *** *  *    * * **     *   *   **   **  * * *   p);
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 *  * *   **        *    *** ****  * * * {
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****     * * * * *   * * *     *  **** ********* *  **  * * *  ** ****  is not a prefix of %s", p, s);
    }
}
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Hidden content!
#include<stdio.h>
#include<string.h>
int main()
{

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**** *** ****** ***    * *  ***  **  *       ** *  *
    int l1,l2,i=0;
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     **** **** *  * ****  ** **** *****      *        *      ** * is not a prefix of %s",a,b);
    }
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** * * * **** *  ** **   * ** *  * **   * *  *  *  prefix = 1;
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  *  *** * ** *   *  *   *****  ***** **    *   * * **   *   **     **  *  *  *   (a[i]!=b[i]){
 ** ** **  * * *  * *** **** ***     *** * **** ***  *  *   **** * *  **  ** * ***   *   * **   ** ********    ** is not a prefix of %s",a,b);
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 * *  **** * *** *  * * * * ** * ** * * **** *  *** ** *
    }
}
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
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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
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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("");
            ^~
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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;
   *   ***   ** **     *  ** **     *       
 ** * *  ** *  *  * *****  *  * *    * *** ** *    *  **  **** ** **  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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-----------Re-judge-----------
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