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 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));
              ^
commented by (4.3k points)
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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));
              ^
commented by (4.3k points)
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Case 0: Correct output
Case 1: Correct output
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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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Case 0: 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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  ** * * ***     *** *   **   *         **  *  ** ***  * ********* *  ** 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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0 0
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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];
******* * ***  * *****  * *  ***  *  *   * *** * *  ***
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    }
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  *** ***   *  *** *     **    *     * **    * * ** *   *   * *  **   *   * *  ***  * * **   *  * **  = 0;
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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)
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
commented by (4.3k points)
0 0
-----------Re-judge-----------
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 *     *  *  * 
#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)
0 0
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0 0
Case 0: Correct output
Case 1: Correct output
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0 0
-----------Re-judge-----------
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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
commented by (4.3k points)
0 0
Case 0: Correct output
Case 1: Correct output
Case 2: Correct output
commented by (4.3k points)
0 0
-----------Re-judge-----------
Case 0: Correct output
Case 1: Correct output
Case 2: Correct output
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