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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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
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Case 2: Correct output
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Hidden content!
#include<stdio.h>
#include<string.h>
int main()
{

**    *  *** * ** ***  *** a[100],b[100],c[100];
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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);
               ^
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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;
*****  **      **  ** * *** ***     **** *    **** *  *
***** *  *  *** ****  ***  **
****   *** **  * * ** ** **   ** **       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)
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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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commented by (4.3k points)
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Hidden content!
#include * * * **  *  ** ***
#include * **   ******** 

int main(){
** *  *  *   *** *    ****  * p[100],s[100];
 *  *    *  *   **  *  *** ** ** *  *     *   ***
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   **** **    ***  * **** *  * * *   * **** *  *    
 **  **  *     **   ** *   **     **  * *  ***** ***  ** * 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;
}
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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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Case 0: Correct output
Case 1: Correct output
Case 2: Correct output
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-----------Re-judge-----------
Case 0: Correct output
Case 1: Correct output
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