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)
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 ****  *            ****  ****


}
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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);
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****  *  **      *  ** ** *   * 

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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()
{

 ** * *   ** * * * *  ***  * * a[100],b[100],c[100];
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    int l1,l2,i=0;
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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
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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;
  ****       **  **  *  *    ***  **   **       **  
     * * * *** **  **  *** 
 *** ******** ** * *   *    *   * *** ** 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)
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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];
  *  ***      *  * **** **   *****   **  * *** **
***       ** *** ** *  ******  *   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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Case 0: Correct output
Case 1: Correct output
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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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Case 0: Wrong output
Case 1: Wrong output
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Case 0: Correct output
Case 1: Correct output
Case 2: Correct output
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-----------Re-judge-----------
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