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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** **  **** ** * * * * *** *** ****       *  ** *** 
   * ******  *****  * * *    * * 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!
**  **  ***    ***  
* ** * *** ***        

int main()
{
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return 0;

 }


if (i==plen-1)
* ***  *  *     is a prefix of  *   **    

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


}
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Case 2: Correct output
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Hidden content!
#include<stdio.h>
#include<string.h>

int main() {
*   **  *   ** **      ***  *  p[1000],s[1000];
  *  * ** *     * ***** * i=0,re=0,len;

* * * ***  * *   *   * * *  *** *   *  *   **    p);
*    * * ****  *   ** ** ** **** *     **** ** s);
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    }
}
answered by (-120 points)
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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
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0 0
-----------Re-judge-----------
Case 0: Correct output
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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;
**  *       * * ** * **  *     *  * *****   *** * **  *   
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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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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;
  * * ** * ** ** *   ** ** ***  * *****   * *** *   
* **  ** * *  ** * **        **   ****  * ** * ******  **   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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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-----------
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Case 1: Correct output
Case 2: Correct output
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