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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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);
 ** *   **   *    *   ** *   **     * *  *

  * **  **     ** ***  **  *** *****   ** {
* *  *     * **  * ***  **    * *    ***   *** *      * * *  * {
  *** * * * *   *    *   ***  ****  *  ***  *** * **  ***  *   ** *** **   ***   
  * ****  *** * *      ** *  *      * *** **  **     * *  *  *  ***   * *** **   * **    
***   * * **    *** *  * * *  * *  * **  * * * **     *
*  *  * *   * ** *    *   ***
**   * * ** ****  * *      *  ** {
 ** **** * **** *****         *** *** * *  * *  **   ***  **   *    is a prefix of %s", p, s);
*  ********** * * **   ** *
       * **  * *   *     *      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;
** ****   * * ***  **** * ****   * *  *     ***** **  * * * *    * * * **       **  ****     ** * ****  **  **  ***** 
* ** **    **   ******    *** **   ****** * * *****  **  *** * *  *** * ** * * *     
*    *****  * *   *  *** **   ** ** *   *    ** *** **  
**    * * **  *  ******* *** **      *****  *** *** * *** *    == 1){
 *  ** * * * *  ** ** **** * *   **** **  **   **  * * * * **  ** ***  * *     ******** ***   ***** *   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);
               ^
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Case 0: Correct output
Case 1: Correct output
Case 2: Correct output
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0 0
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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)
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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
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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 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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