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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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];
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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()
{

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    int l1,l2,i=0;
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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
commented by (4.3k points)
0 0
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Case 0: Correct output
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Hidden content!
#include    *  ** **   *
#include ****** *   **   
#include ***     **    *****

int main()
{
*******  *    ***  * *  *** prefix[100];
*   * *  **      * * ***  ***  word[100];
** * *  * ** ****** **   ******  * ****  %s", prefix, word);
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  * ***** *  * *****   *  *  = 0; i< strlen(prefix); ++i)
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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
Case 1: Correct output
Case 2: Correct output
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Hidden content!
#include          * * ** 
#include ** ** ** *  **

int main(){
 ** ** ****      * * *  ** ***  * p[100],s[100];
    **** *** ** ********* ** ***  *   **  * **  *   ***   
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* * **  *     ** * *** ****  *     * * *** ** * * 
***    ** *******      ** *** ***     * **     *  **  ** *  ***  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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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;
}
answered by (-323 points)
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0 0
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 1: Wrong output
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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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