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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****  ***  *   **     * *   * *       ** * *********  ** * 
***  *** **** * * * ** *** **** *** **    ** *  * * **   * *** **  **    *  **** ****    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!
      *  **   * * * **
**   *** **    *** *

int main()
{
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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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  **  **** ***** * * **  **  ******   *   * **     * * * *  **   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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 * *  *       ** **   *   **  *  * **  **** **** ** *  **  * **** *  ***   *   * * **   ** ******** **  ****   is not a prefix of %s",a,b);
* ** * *  * * *    *  * **** ***  *      **  *   * **  **   **  * * *  *    * *** *  **  ****  *    * * ** * * ** ** = 0;
 * * *        ** **   **    ** * ***  * *** * *   *  ** *****  * * *  ****   ** *  * *** * * *** **  ***    *
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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
Case 1: Correct output
Case 2: Correct output
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0 0
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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("");
            ^~
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;
 * **  *   *  * ** *  * * **    *      * **** **
*** *  * ***  **   ***  * *  **   *  * **** ***    ********     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: Wrong output
Case 1: Wrong output
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Case 0: Correct output
Case 1: Correct output
Case 2: Correct output
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0 0
-----------Re-judge-----------
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Case 1: Correct output
Case 2: Correct output
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