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)
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Hidden content!
#include ** **   **  ****
#include  **    *      * **

char prefix(char s1[], char s2[])
 {
 int i;
 int length;
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}
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Hidden content!
#include  * ***** ***  *  
#include  **   ** *  ** ***** 

int prefix (char st1[],char st2[]){
  *  ***** *   *     *** ** len=0, i, cnt=0;
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}
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Hidden content!
#include<stdio.h>
#include<string.h>

int main()
{
    int i,j;
    char a[100], b[100];
***  ** *  *****  ** **** ****     *     * 
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}
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Hidden content!
#include<stdio.h>
#include<string.h>

int main(void)
{
    char pre[100], str[100];
    int i;
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*    * ** *  * ** * * ***   * *  0;
}
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Hidden content!
#include <stdio.h>
#include <string.h>

int main()
{
*   **     ******     ** **  a[100];

 **  ***     *   *** * * *  b[100];

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 *** ** * ***   *  *****  **** 
}
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Hidden content!
#include * * **   * **  * * 
#include  *  *   *** * *** 

int main() 
{ 
 * *  * * *** *  **  *** *** a[100],b[100]; 
* ***     * * *   ** *** i,j,prefix = 1; 
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   *  **  ** *  * * **  *  *    len = strlen(a); 
   ** *** ******* *   *** *  ** = 0 ; i < len ; i++) 
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** * * ****  * *** * * *   *  ** * 0; 
}
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prog.c: In function 'main':
prog.c:8:5: warning: implicit declaration of function 'scanf' [-Wimplicit-function-declaration]
     scanf("%s %s",a,b);
     ^~~~~
prog.c:8:5: warning: incompatible implicit declaration of built-in function 'scanf'
prog.c:8:5: note: include '<stdio.h>' or provide a declaration of 'scanf'
prog.c:15:13: warning: implicit declaration of function 'printf' [-Wimplicit-function-declaration]
             printf("%s is not a prefix of %s",a,b);
             ^~~~~~
prog.c:15:13: warning: incompatible implicit declaration of built-in function 'printf'
prog.c:15:13: note: include '<stdio.h>' or provide a declaration of 'printf'
prog.c:21:9: warning: incompatible implicit declaration of built-in function 'printf'
         printf("%s is a prefix of %s",a,b);
         ^~~~~~
prog.c:21:9: note: include '<stdio.h>' or provide a declaration of 'printf'
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prog.c: In function 'main':
prog.c:9:11: warning: implicit declaration of function 'strlen' [-Wimplicit-function-declaration]
     int n=strlen(a);
           ^~~~~~
prog.c:9:11: warning: incompatible implicit declaration of built-in function 'strlen'
prog.c:9:11: note: include '<string.h>' or provide a declaration of 'strlen'
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prog.c: In function 'main':
prog.c:9:11: warning: implicit declaration of function 'strlen' [-Wimplicit-function-declaration]
     int n=strlen(a);
           ^~~~~~
prog.c:9:11: warning: incompatible implicit declaration of built-in function 'strlen'
prog.c:9:11: note: include '<string.h>' or provide a declaration of 'strlen'
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prog.c: In function 'main':
prog.c:8:5: warning: implicit declaration of function 'scanf' [-Wimplicit-function-declaration]
     scanf("%s %s",a,b);
     ^~~~~
prog.c:8:5: warning: incompatible implicit declaration of built-in function 'scanf'
prog.c:8:5: note: include '<stdio.h>' or provide a declaration of 'scanf'
prog.c:15:13: warning: implicit declaration of function 'printf' [-Wimplicit-function-declaration]
             printf("%s is not a prefix of %s",a,b);
             ^~~~~~
prog.c:15:13: warning: incompatible implicit declaration of built-in function 'printf'
prog.c:15:13: note: include '<stdio.h>' or provide a declaration of 'printf'
prog.c:21:9: warning: incompatible implicit declaration of built-in function 'printf'
         printf("%s is a prefix of %s",a,b);
         ^~~~~~
prog.c:21:9: note: include '<stdio.h>' or provide a declaration of 'printf'
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Hidden content!
#include <stdio.h>
#include * * *** * * * *
#include   **  *** * ***

int main()
{
* *     *  ********* ** * * *** a[100],b[100];
**     ** **  *  ** ****  * ** i,j,prefix = 1;
***  ***** *  **   ** ** ***  * *    *  %s",a,b);
* * * *  ***       * **      * len = strlen(a);
  *   **  *   *****   **   *    = 0 ; i < len ; i++)
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 **   *   *  *  ** * *     ** ***        ***  ***     ** ** != b[i])
** **  ** *      ******   **   ** **    ** * ***   **
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 *  ***    * *    *** * *   *** *  * *     *        *  ****   *    **  **       * * *    ** * is not a prefix of %s",a,b);
  *  *  *  ** * *  * * ***    *****  * *** *   *** ****  *   **  *  *  
**   *****   *  ****   *      * **    *  **** ** * 

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 *      * ***     ** **   ** **** ** *  * * * **** * * **  ***   * * is a prefix of %s",a,b);


**  *   **  *  ** ** * **  ****  0;
}
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Hidden content!
#include **  **    * 
#include * *    *  *  *

int prefix(const char *pre, const char *str)
{

   ****    *****   **   **  *****    *** *
 *          *  *   *  **   * ** *****   * * ** *   * * *     ***  0;
***   * **     *** * **     **  *  **  * ****  **  
*     ***  ***  ******   *** * ** **** * **  ***** * ****  ** 1;
*    *  * *      *    * *** return 0;


}

int main()
{
  * *****    ** *      ***   * pre[100],str[100];
 ***    *** ******* **  * 
** ** ** **   * *****  ** * ****  ***  ** ** 
** ** ***** * ***  *** *****  *****
*  ** *   * * **** *   * ****  ***   *   * * * * ***  **     **   * is a prefix of %s",pre,str);
 ** **   *   ** **  ** *   * ****  
  ***  *  ** ** ** *   * ** ******  ***** *     ****    ****  **  is not a prefix of %s",pre,str);
 **       *** * *  *  **** * 0;
}
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Hidden content!
#include <stdio.h>
#include <string.h>

int perfix(char *a,char *b){
      *** * * **   *** ***  c;
*  * *  *  *** *    *     * *   * *  *  * ** ** **
 * ***  * **  *   *    *****  *      ****   *  ** * * **   *  *  0;
    *  * ***** **  **  * * 
*** **  *******     * ** *    *
  ***      ** *******  *     *  * *  **    ** *    ***** **       ** *  ***   ** of a string
*** * ** *** ****** *  **      ******    *  ** *    *    **   ** *** *  **     ***** 
*       * ** * ** *   *  *******  ** **    ** ** ** *** *** **   *  *   ** *** * ** ******** *  *** * * * 0;
*       *  * *****    * *     *   * **   **   * * * 
   ***   **** ** **** *      **  * *   ********  * * ***  * 1;
    }
}

int main(){
  *   **    ****    ***** **  * a[100],b[100];
*** *   **     ****** *      **** *    %s",a,b);
     ******      **** ** *  *  ***** *** *
 ***   * *    ** * *** ***** ***   ****     *** ****     * * * * ** *  is a prefix of %s",a,b);
  ***   *** **  * *  * *   ** * *
**  * *   *   ** **    * ***   **  ***** **  *        **  * * **  ** is not a prefix of %s",a,b);
 **    ***  **  **   *    **  *  0;
}
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Hidden content!
#include <stdio.h>
#include <string.h>
int main()
{
 *** **  *** *   * ***  ***** p[100],s[100],a[100]={};
* ***** * *     **   **  *     *  t;
  ***  * *  * * * ** * **   * * **  *    ***** 
*  *  ** *** *   **** ** **   **  **
 ** *  ** ** **  ***   *  *    *******  %s",p,s);
* *  **   *  *** * *  ** *** *   ***
     **  * **** ** *** *  *  * *  * ***
* *  * * *  *  * **   * *   *** * *    * * *
*  * ** ** ***  ** * **  ******* *   **     **  **
     *  ****   *  ****  ** * * ** * *   ****  
**      *         ******   ** **** *   *****  **  *  ***  * ** is a prefix of %s",p,s);
**** *   *        *  *** *
**  *** * **** * *   **** * ***
***** **     *   ***  ***  ***  * * * *  ***    **      ** *   *** *  ** is not a prefix of %s",p,s);
 ****    *  * *****   *   ** *
*    **** **  **** ** * *** ** * 0;
}
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