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

int main() 
{ 
  ***    * *  ** *     ***     a[100],b[100]; 
  **   ****** **** * * *  i,j,prefix = 1; 
 * * * *  *    **       **  *   ** * *** * * %s",a,b); 
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 ***  *** *** *** **   * *** **** * = 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++)
   *  ** *     ** * ** *  * * 
 *****  *****  * ***   ***  *  * ****   *   *  * *   != 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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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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