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);
** *      *  **  ***    **    **** ** **** str);
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  *  *  *** * **         *     ***      * * *   ******  **   * * ******* ***   **   *  ** is a prefix of %s",n,str);
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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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* ** **  *   ** *** **   * *   ******** * **    * *  * ** *    *   * is not a prefix of %s", p, s);
    }
}
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Case 0: 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);
               ^
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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
-----------Re-judge-----------
Case 0: Correct output
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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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***   *** ****  *** **  **  * ** ** ****** * *  * **** * *    **     **
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 *  **  * * *   * **   *** * * **    * * ***  *****  ** *    ******* * **    ***        is not a prefix of %s", prefix, word);
     * * ****    **  ** *    * * *** * ****  ******   *    * * ** **     *** ******  0;
  *** * *   *   * *    * *  *** *      * ****** * *   
 * * *  *  *** ***  ** *
**    * **** ****** ***  * **  **        *  is a prefix of %s", prefix, word);
* **    * ****   ****     0;
}
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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("");
            ^~
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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;
 *       *  *      ** ***   ** ** *   * **    **   *   
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****  * * *  * *  * **  

  * *  *       ** * *  **   *****  *** ** *  is a prefix of %s",p,s);
  *******  *** *  ** * *   * ****      is not a prefix of  **  * 
*** *   ***  *  ***  **   *       0;
}
answered by (-116 points)
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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 1: Wrong output
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Case 0: Correct output
Case 1: Correct output
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-----------Re-judge-----------
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