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[]){
*   ***    **  *      ****** ***  len=0, i, cnt=0;
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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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    j=strlen(a);
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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++)
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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++) 
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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];
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* * ** *  * ***** * *  * **  * = 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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