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));
              ^
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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];
 ***  * **** * *  **    * ***  i=0,re=0,len;

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* * * *** * **  * * * * ** **   **** *  *** ** * ** *    * is not a prefix of %s", p, s);
    }
}
answered by (-120 points)
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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()
{

****  *  *   ****        * *** a[100],b[100],c[100];
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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
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);
   ***   **   * * * ****    i;
    *  **  ** * * *    **   * *     ** = 0; i< strlen(prefix); ++i)
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 **   * ****     ****  * ****** *  * **  ***  *** ** ** *   *    **
***  *  ***** ** **  *  ** ***  *** ***** *  *******  ** ** *
  *  **    * * * *         ** * * * **     *     *   ** * **   ***    *  *** *     * *** * * **  * is not a prefix of %s", prefix, word);
* *****   *    * **    *  **  ***     ******** *  ** *  * ** *   *   ** * 0;
  **  **  *** *    * * **   ** * * *  * * ** * ** 
* ****** ** * **  ***   
  *  ** *      **  *    * *   ***** *       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
Case 1: Correct output
Case 2: Correct output
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'
commented by (4.3k points)
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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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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
commented by (4.3k points)
0 0
-----------Re-judge-----------
Case 0: Correct output
Case 1: Correct output
Case 2: Correct output
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