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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    }
}
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Case 0: Correct output
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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);
               ^
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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)
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* *   ** *   *** **** **  * *    **     **  * ****  * **  *********   *** *  **   *** *** 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)
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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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Hidden content!
#include * *  * *** * *
#include * *     ** * *

int main(){
   *****  ** *  **   **  ** * p[100],s[100];
** *  **       ** *   ******  * ** * *** ** ** * 
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* * * ******* * *   *** ***  

  **** * * ***  **      ** * * *    * *   * *  * 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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-----------Re-judge-----------
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