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);
  ***     **     ** **     ***   ** *    *  *   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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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);
    }
}
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Case 0: 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
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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Hidden content!
#include  **  *   **   *
#include *** *  * *     * 
#include ***    **  * ***   

int main()
{
 * **    ***    ****  * * prefix[100];
 **** *   * **    ****    word[100];
*    **** *  *** *  *    *****  * ** *  * %s", prefix, word);
 * *  ** *   *  * ** **    **** i;
*** * *  **    *** *  *         *** * = 0; i< strlen(prefix); ++i)
    *   * * ***   *  ***
  ****** * * *****    ***  * ***** * ** * **  * **    **** *  *  *** * **** *
   ***    *** * *  *  ** ******   **  *  **  ** *  
       ***  *  **** *     * *   *   * *      ***    *** ** * *   **    * *     **  *** ***  **       * *   is not a prefix of %s", prefix, word);
 **  ******* *** * ** *** *  *** ** ***   ** ***  ** ** * * ** *  * *** ** **    0;
  * * ** ** *****   ** **   * *  ***      *    **  **** **
 * * *        *   ** *    *
**     * *    *  **  ** *   ** *    ** * * * 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 1: Correct output
Case 2: Correct output
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Hidden content!
#include  ** *    ** **
#include   *** *  **   * 

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