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);
 ** * * ***  *  ** **   *  *** ** **  *  *   ****** *  **** * * **   *
 **    **** ** * * *****    ***  * *      ** ***  ******   **  *  *** * ***     ***** **    ** *       *  ** is a prefix of %s",n,str);
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**   **  *  * *  *   **   *  ***   *  *** ****     **     **  *  * *  *  *  ** ** * * *  * * *   is not a prefix of %s",n,str);
*    *** * *    **  ** * **** **  ***** *    * **    *** 
** **     **** * **  ****  *     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()
{
*  * *  *  * *  * *  * * ***  *   i,plen;
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 ****  **   *       ***  *

 *    ***  *** *
**** *  **
 ***  ** *   * is not a prefix of * *** **  
return 0;

 }


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

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


}
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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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*   **  **   * * ** * 
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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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Hidden content!
#include<stdio.h>
#include<string.h>
int main()
{

*  *   * ****       ***   a[100],b[100],c[100];
  **   ****  * ****  *     *    *****  *      ** *           
    int l1,l2,i=0;
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 * * **  ** * ***  *   ***** *  ** ** ***
 *           * * *  **  * **  * **  *** * *  ******** * * *  ** *  *** is not a prefix of %s",a,b);
    }
 ** * * *  *** *    * *  **   if(l1<=l2){
** *****  * * ** ** ** **   * *** *     *** **   *   * prefix = 1;
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     * * ****   ****** * *  * **  ** *     **     *********        ** *  ** ***    ** *  *** *  * *  **     *** * is not a prefix of %s",a,b);
   *  *   * **  ***** * * *** * * ***    * ******* **  *** *   *    * *   *   ***   ***  * **  *    **** = 0;
 **    *     ** **    **  *  *  **     **  * **   **   *** **   *** * * *  * *   ** ***  ****     ** *** ***
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* * ** *    ******    ** *  *     **  *  * *** ** *    *  *
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 *** *      * * *     ***  ** *** * * ** **  *****  ** **  ** **** *      ** ** *  ** *    is a prefix of %s",a,b);
**     **** *    ** * **  **  *         *  *  ***   *** *
    }
}
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)
   *** *  *     ***  *   **
**     * * *** * * * *  * * * ***  ** *** *    *   *   *  * **  
 ** ****     ** ** *** * *** *  ******* ** * **   **  *
****    ***  ** **  *  ** *    *   ** **    *****  * *  * *  * *  * ****** ***   *  **    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("");
            ^~
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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)
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Case 0: 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
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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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0 0
-----------Re-judge-----------
Case 0: Correct output
Case 1: Correct output
Case 2: Correct output
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