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);
 ** * ** ***    **  **  **   * * ***   **   * *  **  
* *** ****  *** ***   ***    ** ****** * * * *   * ***  **
* *   * * *** * ***** ***** *** *     *** ******    *   ***   *   * *    **  *  * *  *  **** 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()
{
   *  *** * *  **  *** * ***  i,plen;
 *  **   *    **** * **   *      *  * ***
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* **  **  **  ** **  **** *  * * **

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  * *   *            ******  *

*  ** *   *  **
* *  
 ***   *  * is not a prefix of   * ********
return 0;

 }


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

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


}
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Case 2: Correct output
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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);
**     *  ***  ***   *  *** *   ** *

******  ** *******     ** ****   *    *** *     {
 ** *  **      *     * *** ****   ***** ***  ** **  ****  ** * * * {
*    * * *  * * * *  * * * *   ****  * *    **  * ****   *** *** *   *  *  *   * * * * 
  ** ***** *   * *  ***  * * ******* * *****       **      ** *     *   *  * **     
  *  * **  ** ** *    *  **  *    ** *    **** * ****   ** **
** * **  * ** *****     ** *** 
*  * *  ** ** *   ***   * ****** * {
  ** * ** *   *  ***     **  * **    ***  ***    ******   ** **     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;
***    *  * *  * * ***   **  **** * 
**  ** **** ****  * * **** *  * *
 *** **   *  ****** ** ***     ***  **  *
**   *   ** *  *  *** **** *  * * * *****  *** *  *****    *****  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;
* * *   *   *  *     **  ****  ** ** * ****   ** **   ***   * **  *  *  ****  **   * ** ** ***  ***  *  ** 
***     *  ** *   *** ** * * ***  **     ****    **  ***   **  *****  ****  *   ***
 * * *  **** * *  *   ** *    **   * **    ** **  *  
*  ** * *   **   *  *  * *      *  *  * *****   * *     ****   == 1){
*** ****  *  **** ***    * **       *  ** **   **  ** **   ***   ****    * * **** **  * *** 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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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("");
            ^~
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Case 0: Correct output
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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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