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));
              ^
commented by (4.3k points)
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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 0: 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<stdio.h>
#include<string.h>

int main() {
 * *   * *  * ***  **  ** ***   ***   p[1000],s[1000];
  *  **** * * *  ***  ******* i=0,re=0,len;

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    }
}
answered by (-120 points)
0 0
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()
{

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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
-----------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)
* * * * *** *   *** *** *  *
*  *  *  ****  **   *** ***** ***  ** *** *   *** * ***   **** * 
* **   *  * *  * * *   ** **  * ** **       
 *** ** * *** *** * *** *     *    *  ****  *   ******   * ***   ** *** ***   ***  *    **** * *  *  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("");
            ^~
commented by (4.3k points)
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Case 0: Correct output
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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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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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0 0
-----------Re-judge-----------
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