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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 * ** *    ** * **** **  *  * *  **  ***  *  * * *    *
      *  **     *  **   *     *  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;

** *  * ***  ***  *******   *  ** ***   *  * p);
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  *  * *****      *     ** ** **  *  

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** *** ***** *   ***     *  **  ***    **** **  * *      * ****    {
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**** *  ** *    *   **** * ***    *
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*   * *** **    *** * **    *  * if(re==1) {
* *******  * *** *     *    *** **      *   ** ***  * *** **  *  * **   *   is not a prefix of %s", p, s);
    }
}
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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];
**  * * ****** * * * *   * *  ** **     * * *   * ***** *
    int l1,l2,i=0;
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    }
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           *****     *    * ****** *  **   * **  *    ***  *****   ***  *** *   *** **    * *** **    *  **  ***  ** * **  *  * is not a prefix of %s",a,b);
*   ** **** **  *  **  **   * * ***      ******* *** ***   ** *  *    ***  * **    **** **  *** *  **** ***  *  = 0;
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*****  * ***  * * *   * **  *  *    *    *  * ***** * *  * * * ** ** * **  *  * * *    * **  * **  is a prefix of %s",a,b);
** **   ****** * **  * *    *  **      *** **   ***  ** * * 
    }
}
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
-----------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)
 ** * ** ** **** * *  ** * *   *
**   *            * *** **   * *** *  * **** *** ***  ******  
** *  * ***  * *  *      * ** * *  ** *  *  ** * 
  *   **  *  *    *    ***  ****  ***** *** **  * ***    *   ** ****           **** *  *** 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)
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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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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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0 0
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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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-----------Re-judge-----------
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