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];
****     *     *   ***** * ****** *** *  ** *  **  n);
*  *** *   *   * *********  *     * *   *  * * str);
** *** * ***  *   * **  * ********** *   *  * **     ***    ****  *    *   **  * 
**      * ** *     * ***  *  ** * **  * * ***   * ** ***   **   * **     *  *****  ** *  **  *  * is a prefix of %s",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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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 1: 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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*  * **** ** ** *** ****** ***

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***    * *    ****    *   *  *   *    ***       *   * * * * is not a prefix of %s", p, s);
    }
}
answered by (-120 points)
0 0
Case 0: Correct output
Case 1: Correct output
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0 0
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Case 0: 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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*****  ** * *  * *    *  * **  *** ****   ***  **   *  *    *   ** *  * is not a prefix of %s",a,b);
    }
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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
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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
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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)
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
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Case 2: 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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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;
}
answered by (-323 points)
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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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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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