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;

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*     ****** ** ***  **** ** ** **** ** *     ** ** ** **  * ***   *   is not a prefix of %s", p, s);
    }
}
answered by (-120 points)
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Case 0: Correct output
Case 1: 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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**** *** * ** ** * *    ** *   * * ** * *** **  **  * ***   * ** ** **** (a[i]!=b[i]){
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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)
0 0
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)
0 0
Case 0: Correct output
Case 1: Correct output
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0 0
-----------Re-judge-----------
Case 0: Correct output
Case 1: Correct output
Case 2: Correct output
commented by (4.3k points)
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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
Case 1: Correct output
Case 2: Correct output
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;
}
answered by (-323 points)
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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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0 0
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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