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 1: Correct output
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Hidden content!
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* ***    *** * ***  

int main()
{
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return 0;

 }


if (i==plen-1)
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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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    }
}
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Case 0: Correct output
Case 1: Correct output
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0 0
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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
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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);
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*  *   *  ******** ** **** *    ** ***  **** * ***  *
**********  ******  ***** * ****
** * * ***  *   ***** *    *  ** ****   *** ** 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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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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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: Correct output
Case 1: Correct output
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-----------Re-judge-----------
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