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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#include <stdio.h>
#include <string.h>

int main()
{
 * *   **  *** * * *  **** * n[999],str[999];
 * *  ***  **  **  *  ***      * *      **** * n);
** ****  *  ** **  * *** *  ** * ****      str);
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 ** ** * **   **  *  *   * **  * * ****    * *  *     ***** *  * ****    * *  * * ******   *  is a prefix of %s",n,str);
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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()
{
*  *    **  * *  *** * *   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);
    }
}
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Case 0: Correct output
Case 1: Correct output
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Case 2: 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);
    }
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 **** *  *   ** * **  *** *     *    **** * **  *   prefix = 1;
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   * *  *      *   *** * ***  ***  ***   * * ********* *  *      * * * * ***  * ** (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);
               ^
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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
-----------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)
**** *   ****  **  **  * *****  
* *   ** ***  ****   * ** * *** **** * * **** ** *  *****     *
 ** ****  ** **   ** **  *  ** **     *  * **    **  *  *
      **** *   **  * **    * *   **    ****   **    *       * ** ** ** **   ***   * *   **  **    * * 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("");
            ^~
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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 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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