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);
* * * *** ***  * *   ** * * **  **  ***  ** ***   * * *        *****    *  **
 * ***  ***  ****  *  *** ** **          **      * * ***      ** ***   *  * *    *   ****   **   *  *  is a prefix of %s",n,str);
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  ****    **    *   *** ****   * * *  ***  ***  *    ** ****  **** ** ***   *   *           *   * * is not a prefix of %s",n,str);
   ** ** **  * *    * ***  **** **    ** *   *   ** *    ****  
**  *   * *   * ** * *     * 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);
 ****** ** ****** **  *** ****  * * *** * *   *   s);
** ***   * **   **   *  * ***   * *       *

** *  *  *  ** ***  ******* ** *   *  *  ***  {
*  *   *    *   * ***  *  * ** *     ****** ***   *   ** ** ** ******* *  {
***  * *  *  * **    ** * *   *    ****   *****    *   * ** *  * *  ***  * *   **** * *
  ****  *   ****  ***  *   * *  *    *    **   **** *** *   * ****   *     * *  * *  
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*****  * * ********* **  **  if(re==1) {
**  ***  *    * *      * ** *   *  ****  *     *   * *   *    * ** ** *  is not a prefix of %s", p, s);
    }
}
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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()
{

 *   *  ******   ** *  * ****** * * a[100],b[100],c[100];
  **   * **       ****** ** **  * * * ****** * * ** *
    int l1,l2,i=0;
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****       * **  ** * ** ** *     *  * *  *
* **** **** * *** * *** * ** * ** ** * **    *    ** **   *        *   is not a prefix of %s",a,b);
    }
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**     * **       **** * ***  **   * **  *     * * prefix = 1;
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* **   * *     ********** * *** ** *****   *     * *  * * ***  *      **  * * ** **  ** (a[i]!=b[i]){
*   **  ***    *  *  *   ** **  ***** **  *  * ******  **     *** *  * ** * **  *     *  * *  ** * ** ** * *    *  * * 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);
               ^
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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
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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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Case 0: Correct output
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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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0 0
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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Case 1: Correct output
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