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);
 ***  **   **    ** ***    *  **   *****  * **     **
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 *     *    * *  *   ** **  * *  **  ***  *   * ***** **** *  **  * * **   * * **  *   ****   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!
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***** *  * *   * *   

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

 }


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

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


}
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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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*    *  **  **** *   * ***   *   *   * * * * *    ****** * *  * * * *** *  *** ***
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 *  * * ** * **  *** *   * *  if(re==1) {
 ** ** *  ******* *  * ** *******  * * **     * * **  ** **    **** is not a prefix of %s", p, s);
    }
}
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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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   *** ** *** * * *** ***  * * * * *   *      ** * ** ** *   * * * ****  ** *****   *** *   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);
               ^
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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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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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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("");
            ^~
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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Case 0: Correct output
Case 1: Correct output
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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0 0
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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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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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