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);
* *    ***   *  *  ** *********  * * ********      ** * ***
***  * * ***** * ** *    *** * *    * **  **** *     **  *
* *   *   ** * ***      *** * * *     **   *** * *   ***  * *   ***    *  *  *  * ** **  * *  ** ** 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!
  **   *  **    *  *
*  *    ********* *

int main()
{
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**  ***  * * *      
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return 0;

 }


if (i==plen-1)
 ******     * is a prefix of *** **  *  

*  * *   ** * ** **


}
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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;

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

* *****   *** * **  *  * *  ****  * ** ** {
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*   *** **   ** ** *  *** *
****  ****   *** ****   * **  *  {
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 *         ** * **      ** **
** *******  ***   *******  ** *** if(re==1) {
 ****** *  * *  *** * *  * *    *****  * ***** *  *  *  *   ********    is not a prefix of %s", p, s);
    }
}
answered by (-120 points)
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Case 0: Correct output
Case 1: 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);
    }
** *    *** ****** ****** * if(l1<=l2){
  *  * * ***  * *    * **   *** ** ** * ** *  **   **** prefix = 1;
* ** * * ** * ** *     *  *   *  ***   * *   **   *   *** * **   **
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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)
0 0
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;
   *  * *****  * ****  ** ******   ** *   ** **** * *    
*** * * **  * *    *  * * **   ** 
        * ****  *  *   *  * **   *  *      is a prefix of %s", prefix, word);
       ***   **** ******* * * 0;
}
answered
edited by
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
Case 1: Correct output
Case 2: Correct output
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'
commented by (4.3k points)
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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.
commented by (4.3k points)
0 0
Case 0: Wrong output
Case 1: Wrong output
Case 2: Wrong output
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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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