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];
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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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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];
   ***  ** ** ****  * ***  * **  i=0,re=0,len;

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    }
}
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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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    }
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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)
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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;
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*    **** * ** ******  ******* 
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*** **  ****    **** * *** ***   *      *  **  *    ***    **  * *  *  ***  **  *  ******  ** * is not a prefix of %s", prefix, word);
  * *   *  *** *  ** ***  *  *  * * ****   * *  **** ****  *    ** ** * * ****   ** 0;
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 **  * **   * *** ** * ***
  **  * *      ***  ** *  * **   ** * * 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)
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];
 *** * * **  ***** **  *** * * **  ***    *** *  *****
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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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Case 0: Correct output
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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-----------
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