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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Case 0: Correct output
Case 1: Correct output
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Hidden content!
   * * ** * *  *** ** 
***   * ***   *     **

int main()
{
 *      ** *  * * ** **  **** * ** i,plen;
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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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***    *  * *  *   *  *  ***   {
* **  *  * * * **    ********* *   *   *    *  * ** * *   ** * * * ** is a prefix of %s", p, s);
    ***  * *** * *  *  **   
 ** *  * ** **  *  *  * * if(re==1) {
 ** *  *     ***** **    *  *** ** ** * * **   *  *  *  *    ***  ** is not a prefix of %s", p, s);
    }
}
answered by (-120 points)
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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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*** *  ****  * *  **   *** ****    **
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*** *   *** **     *    *  * * * * ** **  ***  ** ** ****  *  *   is not a prefix of %s",a,b);
    }
***  *  *    * ** * *  **   * *** *  if(l1<=l2){
 **    ****   *  * *   *         ***   * * * * **  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);
               ^
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
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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)
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
Case 2: Wrong output
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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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