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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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 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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*****   *   *  * **   *** * *  ** **   ***   ****      ** *    ** 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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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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    }
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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
Case 2: Correct output
commented by (4.3k points)
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;
  * ** *  *   **  *  ******* ** = 0; i< strlen(prefix); ++i)
  ***** *  * **   ** *  *  *
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***  **  * ****    ** *  ***      * **   *  *  
**  **   **  ***     *** ***  *** **   ** * * *   *** **  * ** * *     **  ***  ** ** ***  **   *  *    is not a prefix of %s", prefix, word);
 *****   **  ****     * * *  * *   ***  * *    *   **  * * **** ****** * *    *   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)
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];
* ** * **  * ***   *  * *   * ** * * *  * **   * **  
   * *   **** *   **  ** 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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Case 1: Correct output
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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;
}
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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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0 0
Case 0: Wrong output
Case 1: Wrong output
Case 2: Wrong output
commented by (4.3k points)
0 0
Case 0: Correct output
Case 1: Correct output
Case 2: Correct output
commented by (4.3k points)
0 0
-----------Re-judge-----------
Case 0: Correct output
Case 1: Correct output
Case 2: Correct output
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