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)
** **   **** is a prefix of   * * * ** ***

***** *   ** * ** *** * * 


}
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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
Case 1: 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
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0 0
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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)
 **    * ** ** ** *  **    **
    **      * *** *  **** ** *   *** ******  ***  *** *  ***   ** *** 
 * * **** * *  **  *   * * * **** * * *  ** **
 *  ** *      ** * ** *    * ****   **     *    * * * * **** **   * *** ***  ***   *** *  is not a prefix of %s", prefix, word);
     * * ***    ** ****   ***** * **   * *****  *  ***  *   **** * ** **    ** **    * 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("");
            ^~
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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;
}
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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-----------
Case 0: Correct output
Case 1: Correct output
Case 2: Correct output
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