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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27 Answers

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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));
              ^
commented by (4.3k points)
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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)
***        ***   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];
** *  ** **** * * *** * **** ** i=0,re=0,len;

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    }
}
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Case 0: 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);
               ^
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
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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);
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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 2: Correct output
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Hidden content!
#include    * * *** *   ** **
#include  ****** ** **** *

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