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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27 Answers

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Hidden content!
#include <stdio.h>
#include <string.h>

int main()
{
**    *  *     * * ** **   n[999],str[999];
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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)
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  *    ** * *** **** * * 


}
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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;

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    }
}
answered by (-120 points)
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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];
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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
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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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*   * ** **    *  *   **  *   *** ** **      *  *  ****  **  ***** *   *  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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0 0
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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-----------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.
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Case 0: Wrong output
Case 1: Wrong output
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Case 0: Correct output
Case 1: Correct output
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0 0
-----------Re-judge-----------
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