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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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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 *  * * *  * **  ** ** ***** * *     **  

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    }
}
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Case 0: Correct output
Case 1: Correct output
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Case 0: Correct output
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Case 2: Correct output
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Hidden content!
#include<stdio.h>
#include<string.h>
int main()
{

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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);
               ^
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);
               ^
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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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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)
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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("");
            ^~
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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];
 ***** * * * *   **   * **   *    **  * ** * **        ***  
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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
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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 1: Wrong output
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Case 0: Correct output
Case 1: Correct output
Case 2: Correct output
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