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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    }
}
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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    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);
               ^
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
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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);
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    * * *  * * ** * *** *  *  ** = 0; i< strlen(prefix); ++i)
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 * ***     ****  **  *  * ****   * *     *** ** **      *   *   **   **  
****  **  *  *  ***  * ****     * *** *   ****** **  *
  **  ** **   * *  *  ***   ****       *   * * *  * * *** *   *** *  *   *****  * **  *  * **  * is not a prefix of %s", prefix, word);
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*  * *******  *      ** *  * ** *  ***  ******     *
***  * ** ** * *** **** *** * 
   **** *  ***  * * ** * * *      * * 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
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];
**  *   ** ******** *** **  **   **  * ***        ** 
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*  *    **  **   *  * **   **  * * **  ** ***    * 
  *****  * *    *  *  ***     * ** *  * ***      **    **  *   *  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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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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