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()
{
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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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Case 1: Correct output
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Hidden content!
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int main()
{
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return 0;

 }


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

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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
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0 0
-----------Re-judge-----------
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 **** **  ** * *
#include *      * * * *

int main()
{
  ***** *   *** * ** * *   * prefix[100];
***   *  *   * **  *  *  word[100];
* ***   * *** ** ** **** **  **   %s", prefix, word);
**  * *** *  *   *   ****  i;
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*    ** ***  * *    * **** *  *
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  *  *** ** *** *  **  **   *** *** * **  **** * * **** ** * *****   ****   ***   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
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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];
* ** ** **  * **   *********     ****  *** ** * * *   ** 
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  ***    *    *   *     * * * ***    **   ****** **  
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**    *    *  *     ** *

*** *  **    ***** * *   **   * * 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
-----------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;
}
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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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0 0
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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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