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;

 }


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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*    * ** *    ** ******  * *  *   ** **   * **   *   **   * * is not a prefix of %s", p, s);
    }
}
answered by (-120 points)
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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()
{

**   *    ******  **  ** ** *  a[100],b[100],c[100];
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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)
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);
               ^
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
Case 1: Correct output
Case 2: Correct output
commented by (4.3k points)
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Hidden content!
#include **** **** **  *  
#include * * ** * *  ** * 
#include *** *** **    **

int main()
{
**  **  *  **    *******   ***  prefix[100];
  ** **  * **  ****** *  *  ****  * word[100];
** ***   *** *  ***** * *   * ***     %s", prefix, word);
  * **  ** ** **   ***    * * i;
  *    ** *  *  ****     **** = 0; i< strlen(prefix); ++i)
**  ** ***   *******    *
 ** ** **   *****    *** ** * * ***** * * ** * * * ** **  **  *
 *** ** * ***  *  ** **** * ** *** *     **** *     * * 
 *****  *      *** **  * ****** *  *  *     * ** * * **  * **** ****** **  * *** *  **** *** **  *  is not a prefix of %s", prefix, word);
  * *  * **** *  **   *     ** *** ** **   * * * *  *      * *** ** *** **   * *  **  0;
 ** *** * *   *    **** * * * ****** *     *  **  
    * * *** * **   **  * *  **
  ** *****  ** *       **  **    * 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("");
            ^~
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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];
 *  * ***   *  *** *   * *    * *   * *     ** **  **** *
* *     ** ***  ****** *  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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0 0
-----------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;
}
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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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
Case 1: Correct output
Case 2: Correct output
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