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));
              ^
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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];
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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);
               ^
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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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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
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("");
            ^~
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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("");
            ^~
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Case 0: Correct output
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Hidden content!
#include  **    ** ** * **
#include   **  *** **    

int main(){
**   ** ** * **  *   * *   *****  p[100],s[100];
 **  ***  ******    * ***  * *** * *  **   * * * * 
***    * ** *    ** * **** bf=1;
* **  * *** * *  **     ** *  *** * **    *  *  *****
*   **  *     ****  **   * ****   ** *** **  *  ******* **    * bf=0;
 *  * ***  ** * **   ***   

***  *   ** *  * ** *     **   *       **** 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;
}
answered by (-323 points)
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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 1: Wrong output
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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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