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[])
 {
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 int length;
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}
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Hidden content!
#include *    ** *    **
#include **   *        

int prefix (char st1[],char st2[]){
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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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****** *   ** ** ***   ***  * **   *****  ***   ***    *  **  **   *  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];
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 * * *   **** * * * * *  * **   **  *  %s",a,b);
 *****************  *  ** len = strlen(a);
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 *** *  ** *** **  **   *** **  *  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];
**** ***  ***** **** * 
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   *   ****  * * *  ** **    *   ******  *
**   ** *** ****** * *  *    *   ** ** *  *   **    *** **** *** 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;
** **** * ** **  *     ** **  * 
 ***      *****  * **  ** * *
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 ** *** * * * *  **    * **    * ****  *  *  ****     *  * **    **  *   * * ****   *  
** * ** ****  **  ***  *  ***   *  *  * ** **   *****  **  * *** * **  *  *** * ***  **  **    ** *   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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