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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 }


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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];
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*  * ************ *   * ***  ****  * * **  *** *    *  ** *   **** *  is not a prefix of %s", p, s);
    }
}
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Case 0: Correct output
Case 1: Correct output
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0 0
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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);
               ^
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
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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);
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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)
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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("");
            ^~
commented by (4.3k points)
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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 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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