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];
 ****  *       * **  * * *   **    *** **  n);
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 * *****    **   ** *    *        *  *** * ** * *** *   *     *  *   *      
 *** * ** * * **     ** * *      *   *   ***** *****   *** **** ** * * *   * * * * 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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Hidden content!
    *******  *  *** ** *** 
  *** **  *  **   

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;

 ** *** * *  ** ** ** **  *** ***    * * *  p);
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* * *  *   *** **   *** *   *  *  *

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