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() {
  **** * **** ** * * *  ***   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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Case 0: 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];
**  *  ** *  ***     ****   ***   * *     *
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    }
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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);
               ^
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)
*   ** ***    *  *  *** * * 
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***  ** * * * ***          ** * **  *** * ** *  *  ** *  ** *    *  ** **  *  **** **   *  **  * *  *  * 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("");
            ^~
commented by (4.3k points)
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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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0 0
-----------Re-judge-----------
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