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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#include <stdio.h>
#include <string.h>

int main()
{
 *   **        **   **    * ** * n[999],str[999];
** **  ** *   ***   *   * *   **   ** *    * n);
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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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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);
    }
}
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Case 0: Correct output
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Hidden content!
#include<stdio.h>
#include<string.h>
int main()
{

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    int l1,l2,i=0;
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    }
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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);
               ^
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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
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
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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
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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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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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