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;
 int count=0;
 
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 }

int main(void)
{
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 *  ******     * *** ** * ** * 0;
}
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Hidden content!
#include *   ** ***   **
#include **  ****   * ****  * **

int prefix (char st1[],char st2[]){
    **  **  * *   **  *  len=0, i, cnt=0;
 * **  **** ** ** * ********  
****** * **  **** ** *****    = (unsigned)strlen(st1);
  * *** **** *   **** 
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***  *  ***    **  *    **
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* * * ** **   **** *   * ** * 
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 *** **  * * * ****    ***    
}

int main(void) {
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** *  * **  * ***** **  * (prefix(st1,st2)){
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      ** *  *  *     * * **  
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 * *   * * **     *    *   * *  ** *   *********     ***   *  ** *  is not a prefix of %s", st1, st2);

** ***     *  * *   * ****** ** 0;
}
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Hidden content!
#include<stdio.h>
#include<string.h>

int main()
{
    int i,j;
    char a[100], b[100];
  *****   * ***  * *   ** ** *  *  * *** *    * 
    scanf("%s",b);
    j=strlen(a);
    for(i=0;i<j;i++)
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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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**      ** * *     *  ** ***  *  * ***   *   *   * *** *
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* * ***    ***    * **  ** * *** * ** **     **     * ** *** * ****  * *     ** **  **  * ** ********** **   ***  *** *  * *  is not a prefix of %s",pre,str);
 *  *** ***      ****** * *****  *** **** ****      ** *  **   ***** ***  *    ****   

* *      **   *   * *     ** *   0;
}
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Hidden content!
#include <stdio.h>
#include <string.h>

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

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

***  *  * *  *      * *****   i = 0;

 * *** *     *  **   ****  prefix = 1;

***** ****    ** * * **   **  * * **   * ** a, b);

 *   *  * *  ** *  **  *  *     len = strlen(a);

    *   *   *  *  *   * ****** = 0; i < len; i++)
 ****   **        * *  * 
 * **** ****   ***  *  **      * * ***   *  ***   *** *  * ** * * != b[i])
 **   ***  **    **   * * ******    * *  * *** ***     * ***      
**  ****   **** ** * * *  ******  **** *** *** * ***  **** *  ***  * *****  **** = 0;

* **  * *   *   ***   * *  *** **  ******* *  *  ** *** **       * *** *  ***  *    * * *  *  *  is not a prefix of %s", a, b);

***** *  **  ** *    *    ****  ** * *    *** *   *   * **** *  ** ** * **   *
* **  * *  * *  **   ** ** ** * *  **  **  ****  *
** **  *    ****    *  *** 
* * **   ** *   *     *    ***    * == 1)
* **  *  *   *     *   * *   
*  *** *   *  ** **  *     *  * ** **  *    * ** * **  *  *       *       is a prefix of %s", a, b);

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

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

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

 
****** *  **   * * *  ** *  * ***  **** 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++)
 *** * * *  *  *** **      
 ** ** * * *  *** *** ** * *******  * * ***   ***  * *  != b[i])
** ****   ****** *  ******  * **    *****   ****  *  *  
  ** * **     *   *     * **  ***     ***    ***  * * *  **  *** ****   * *****  *   = 0;
 *  *  ** * **  **     *  ** ** **    ***** ****   *** *  **   *  *  ***   *   *    *  *   * is not a prefix of %s",a,b);
     * * **    ***   *         *   * ****   ** * *  ** ***     *    ***** * *** * * *
***   * ****  * * **** * **    **  *  **   * *      ** *

  *    ***   **  ** **** * *
*** *   * **   *   ** ***   *  **  * ** == 1)
*  **  *  * *    ** *    * *****   * * *** *** **   * *  *    **  * 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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