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 1: Correct output
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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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    }
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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
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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commented by (4.3k points)
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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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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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