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));
              ^
commented by (4.3k points)
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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;

 }


if (i==plen-1)
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*    ***  *  ** **  *  ***   


}
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Case 0: Correct output
Case 1: Correct output
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Case 0: Correct output
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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)
0 0
Case 0: Correct output
Case 1: 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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 *  * * *  ** **** *** *  *****  * ** *   * *  ** ****  *  * ** **   * ** * * ***    ** 0;
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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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-----------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-----------
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Case 1: Correct output
Case 2: Correct output
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