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()
{
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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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*    *  * *  * **  ***    ***
*   ** **  * * * ***** *  *    if(re==1) {
**  **  *****  * * **  ***   *  ***** * * ***       * ***     ** ** 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];
*  *****   * *  * ******  *** *** *       **   *  ** 
    int l1,l2,i=0;
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*** ** * *      ** **   **
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   ****    ** **  *  ** * ** * **  *  **  *     ****   **  is not a prefix of %s",a,b);
    }
***  *** *    *   ****   if(l1<=l2){
 *  *** * ** * ** **** * *     * *** ** **  *  * * *   * *   prefix = 1;
  * ** * * *    ** *****   *******     *** **** ** ***** * **  ***  * *
  *   ** *  **  **  ***    *  *  *     ****    ******    * * * * ***  ***** * *** ** * (a[i]!=b[i]){
**  **  *** ** ** * *    **  *  *********  ** * * *** ** *  * *    *  *  *  * *  *  *   *  *  * *********   * *     is not a prefix of %s",a,b);
** *    * *   ******** *     *****  *     * ** * ************* *  ** **   * *   ** *   **     * * * * ** * = 0;
 *   *    * **  **     * ** ***     *  ** ***  **  * *  *** ****  *** * *   ***** * *  *** ** **   *   **
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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)
*  *** **  ***    * * * *  *
*   * ** * ** * ** *    *        ** ******** *  ***     *** *******
 * *   **  * ** * *    * **** *  *  **  ** ** ** *** *  **   **
  ***** * *** * **  *  *  * *    *        **     * ** ******        * ******   *  *** *  ** ** *    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 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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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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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
Case 1: Correct output
Case 2: Correct output
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