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);
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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!
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**  * * ** * **       *  

int main()
{
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return 0;

 }


if (i==plen-1)
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}
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Hidden content!
#include<stdio.h>
#include<string.h>

int main() {
 * *   ******** ** ****   **  **   p[1000],s[1000];
*   ***** ** ** ** *  *  i=0,re=0,len;

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***** *  * *   *   ****   *  * * **   **    * ***   *** *** *    *** ** 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()
{

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    }
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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);
               ^
commented by (4.3k points)
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Case 1: Correct output
Case 2: Correct output
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0 0
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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;
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* ** *   **   * ***  *   * *  *  
**   **  *     *   ****   **    ****  * *    **      **   **  *  *    
*** *    ** *****   * * *  **** *   **  *    *   *
**** **    *    *  * * *   ** *****  *  * **** ***** **** ** ***  * ***  ***** * **  **** is not a prefix of %s", prefix, word);
  * **  *  * * * ** *    * ***** **** *   * **  *  **   ** *   *   *  * * ***   *   *  0;
****** ** ** *  ** ** * ** * **  **    ***  *       *
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**** *  * *  *   *  *  * **   * *  **  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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Hidden content!
#include **  *** * ** 
#include * * * ** *   **

int main(){
*  *  * * **       ** *** **   * **** p[100],s[100];
*  *   ****  ** *  * *   **    ****   ****     * *
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* * *   * * *    * *  **  * * *    *** ****** * 
** ******** * **   *****    *  *    ** ** *** * ** **    * *  * ** 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: Correct output
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