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[]){
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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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*     ** * *   * *** ** * *  **  *** * **** * *** *    * *   * 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); 
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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;
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*** ***   *** *   *****   **  len = strlen(a);
     *   *** *** ***  ***  * * = 0 ; i < len ; i++)
 *  *     ***   **** *** 
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 * * *  *       *  *  ******    * ****   ****   * **  ** ** * *        **** *   *    *  is not a prefix of %s",a,b);
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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;
     ** * * *  *   *** *  *** ***    ** ** 
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*** * ** **    *  * * **   * * ** return 0;


}

int main()
{
       *   ***** *  * * ***  ***   pre[100],str[100];
* *   **    *  *    ** *
**  **  *  *  *  *** ***   * **   * ** * ***  **  *    **
* * ** *** *  ** **   **     *   ***    ** 
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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 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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