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);
**  **** ** *  * *****   ***   **  ** ** *   *   **** *
  ****    ***   *      * * * **  *    ** *** * *      
* ***   *   **  **   * *  *    * *** **  * * *  ***  **** *    ****** **    *  * ** ****  ** ** *  * 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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Case 1: Correct output
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Hidden content!
** *  *  * *    *   
*  ****    *  **     

int main()
{
*   * * *   **  *  ** * * * ***  i,plen;
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*      ** *  *  *******   *     *           * *   i++)
  ** **** ** *  * * *  *  

 * **   *  ** **
*   ** 
         **** 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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 ***   * **  ***** **    ***
* * * ***   *  **  **  **  *   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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    *      *** * ***  **** ** *** *** * 
 *  * * *  * * * *  * *   *  ***   * * *   
** * ***     **   ** * * *  * ** *** * * **** *** *  * *    ****  * 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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 **** * ******* ** *  *   *    *** * **    * **** *   ***** *   *  *   * *   * *  ** **********   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);
               ^
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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
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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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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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