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 0: 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() {
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**    ***      *    ****** *  * 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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    }
}
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
commented by (4.3k points)
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Hidden content!
#include      ** ** *  **
#include *****           * **
#include       * * **

int main()
{
*     *  ***  ****    ** ** *   prefix[100];
****   **   * *    * *     * word[100];
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    ** *****  * *****  *** *  i;
**** *   ****** * ** *     * **  **  = 0; i< strlen(prefix); ++i)
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****      **  ****  **** *  **  *** *  *** * *** *** * 
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 * ** ** **   * ** **  *   * * *  *  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];
   * ** *     *  **   *  ***** * *         *  * * 
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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;
}
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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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