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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*     *  ** ****   *   ***** ** **     *  * * **   **  
 * *** **  *    *   * * *** *    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)
*****    * is a prefix of  ** * *   

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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);
    }
}
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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];
   *  ***    *  * *   ***   *   ***  *    *    *
    int l1,l2,i=0;
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** *  *  * *     * ** *    *    ****
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    }
*  ** *   *  *** *  **  *   ***  if(l1<=l2){
*  * *  *   *   *  ****    ** *  *   ** **  **  *       *  prefix = 1;
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****  ***    **  * * * * * ***  ***     ******  **    *******  ***         * *  **    * ** (a[i]!=b[i]){
**  *     *** ***  * * ** **  * * ** ***  ** ** * * ** ** *  ***** *  ****** **  * * *****  *   * **   * *** ***   **  * * 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);
               ^
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);
               ^
commented by (4.3k points)
0 0
Case 0: Correct output
Case 1: Correct output
Case 2: Correct output
commented by (4.3k points)
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
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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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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