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);
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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));
              ^
commented by (4.3k points)
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Case 0: Correct output
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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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Hidden content!
#include<stdio.h>
#include<string.h>

int main() {
    **  * *  *  * ***** * **  ** p[1000],s[1000];
** *  *  * ***  *  *    * *** ** * i=0,re=0,len;

  *** *   * ***** *  *   *     *  **   * ** *  *   p);
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******* *  * **   *    ** **   ***** 

*  ****  * *** ***  *  * ****** *    ****** {
  ***  * *** **  ** *    **  * *    ***   ****** ** ****  * * ** *** {
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    }
}
answered by (-120 points)
0 0
Case 0: Correct output
Case 1: Correct output
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0 0
-----------Re-judge-----------
Case 0: Correct output
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Hidden content!
#include<stdio.h>
#include<string.h>
int main()
{

 *****  **** * *     *    ** ** a[100],b[100],c[100];
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    int l1,l2,i=0;
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    }
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*   * ** *** *   *     *  * *   * ** ** *     ****  ** *  **  **** **** * * **** * *****  * ** ****** ** *     *  * **** is not a prefix of %s",a,b);
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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
commented by (4.3k points)
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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'
commented by (4.3k points)
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0 0
-----------Re-judge-----------
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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;
}
answered by (-323 points)
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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.
commented by (4.3k points)
0 0
Case 0: Wrong output
Case 1: Wrong output
Case 2: Wrong output
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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