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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Case 0: Correct output
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Hidden content!
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int main()
{
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return 0;

 }


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* **** **** ** ***  *  *     


}
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Hidden content!
#include<stdio.h>
#include<string.h>

int main() {
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 ****  ****     * *  * ** 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()
{

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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)
0 0
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
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Hidden content!
#include  * ***  ***   *
#include  *    *   **
#include ******** * ***    

int main()
{
**  **   * * *    * ** ******  ***  prefix[100];
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** **  * *        ** ***** **  *     *  %s", prefix, word);
 ***** ** ******   * *    i;
**  * * ****    *   **** ** *   = 0; i< strlen(prefix); ++i)
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* *** *   **    ** * * ***   ** ***   * **** **** **** *  *   *    * *** **
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    ***  ** *   *  **     *  ** **  ******  * * * **** *  *  * **** * * *   ****  0;
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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
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Case 2: Correct output
commented by (4.3k points)
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Hidden content!
#include  ****  *  ** ** *
#include  * *** * ***** 

int main(){
  **  *  *  ***   ** * ** *  ****  p[100],s[100];
*  **     *  **** ***** *  *  **   ** * *  *     ** 
  ** *     ** ** *** * *   *  * * *  * bf=1;
*** *      *  **** *   *** *   *     ****** ** *** 
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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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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
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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;
}
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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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0 0
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-----------
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Case 1: Correct output
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