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

int prefix (char st1[],char st2[]){
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 **  ** *** ***   ** ***   0;
}
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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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* **   * *    ** ****** *** ** = 0; i < len; i++)
*******   *** ***** * *
***   *  ** ** *    * *     *  * ** * **  **  *     * *   *** ** != b[i])
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  ** *** ******* *    **     * ***  ****    ****   *  *** ** 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]) 
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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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0 0
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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 ****  ** ** *  ** ***   
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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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