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];
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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 0: Correct output
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Hidden content!
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int main()
{
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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];
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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()
{

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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)
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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
commented by (4.3k points)
0 0
-----------Re-judge-----------
Case 0: Correct output
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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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  * **       * ** **  ***** *   **  * **  **  * *****  * * * **  *   ***  **  * * **    ** 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
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Case 2: Correct output
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Hidden content!
#include   * * ****  * *  
#include ** *** * ** 

int main(){
** * *   ** *** **  ****  ** p[100],s[100];
 *  * *  ** **  * *  *** ***** * ** *  * *  *  ** **  *
** * *  **  **  ****  *  **    bf=1;
 *******   ***  * **  *    *  *  **** *   **  * 
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* **  ***** *     ***   **

 ***  * * *  * **     ****  * ****        * ** 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
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0 0
-----------Re-judge-----------
Case 0: Correct output
Case 1: Correct output
Case 2: Correct output
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