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

 ***  ** **  ***  ** * *   *       * ***   {
* **     *   ***  ****** ****     * *** ****** ***   *** *  ** {
*    **  ** * * *  *  ** ***         * **** *   ***  *    *  *****   **  * ** 
*  **       *     * *   * *  ** **  ****   * *  *****  **    * **  **** ** *** ***  ***  *  ** * *    ****  
  ** *  *** ***  *** ****  ** * **  * *  * * * **  
  *  * *  * *    * * * * 
* * *  ****  *** **** * * *  * * {
*** *****   ** ***** ***  *****  ** *** *** *** **    * ***** *  *  is a prefix of %s", p, s);
*** * ** *  ***     * **     
  *  **     **  *  *****  * if(re==1) {
***** *  **  * ** ** *  ** * **   * * *** * * *  * * ** *  * **   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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0 0
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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;
 * *  **     ****** **  *  *  **** *
 *****   * ** ***** ** * * * *   * **
  * *    * ** * * *  * *** * **  * * *  
*******    ****** **      ***  *   *    * * *  *       **    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);
               ^
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("");
            ^~
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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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-----------
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Case 1: Correct output
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