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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27 Answers

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Hidden content!
#include <stdio.h>
#include <string.h>

int main()
{
*** *   * ** ** ** **  *  **   n[999],str[999];
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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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Case 2: Correct output
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Hidden content!
#include<stdio.h>
#include<string.h>

int main() {
  *  * ** *  **      *  p[1000],s[1000];
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    }
}
answered by (-120 points)
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Case 0: Correct output
Case 1: Correct output
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Case 2: Correct output
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Hidden content!
#include<stdio.h>
#include<string.h>
int main()
{

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    }
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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)
0 0
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)
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*** ***   ********* *** *      * *  **  ****** * *** 
* **** *     *** *    *  *  *       **  *   **   * ***   **  *  *  * **  *** ** **  **  * ***  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
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commented by (4.3k points)
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Hidden content!
#include ***      * ***  
#include   ** *** *  *  *

int main(){
*  *    ** ***     *  * *  p[100],s[100];
* *  * ** * *   *****   * ** *  * ** **  * *  * ** 
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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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0 0
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;
}
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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
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