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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**  * *  * * **     ***  *    *   *  **  *** i++)
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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
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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**  ** *  * *  * * * * ** *   ** * *
* ** ***  **** *** **  * **  ** **    *
*  * * *    **   ****  ***     * **     *   *     *   ****   ** **  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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* *     *** ** * **     ***  *   * ********** ****  * * *
** *  *   ** * ** **     *  * * ***** *** ***    *  == 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
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)
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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)
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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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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 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
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