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[]){
*****  * *   *** ** *** *  ***  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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}
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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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* ** * * *     **  ***    ***** len = strlen(a);

*   ** * *     * *  *** * ***  *     = 0; i < len; i++)
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   ***** *** *  * *  ***  *** * * ** * *** ****  * *** *    ** ** * * ** ** * ** * ** ** * *** **  * *  is not a prefix of %s", a, b);

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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; 
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    * **     *  *  * **  ***** 
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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];
*  * ** * *  ***** * **  **  i,j,prefix = 1;
** *** ***   * *** *     **** * **  ****  %s",a,b);
**   *  **  ** *** *     * * **  len = strlen(a);
 * ***  *  *    ***** * *      = 0 ; i < len ; i++)
* *  *  ** *   * *  ** **** 
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 * * ****  * * *** * *   * * * *   ***   *   *****   *
*      **  ** *   *  *  * * ** * *   *      ** *******   **   * *    *****    *  = 0;
 * *   ** *  **    ** * * *   * **      *   ***  ****** *  **  **  *  **  *  ** ****  *          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;
   **     * ** *  * *  * **  *      ** ****  *   *   *
  **   *  * ***** ** **** * * * **   *  * ** *  **   *  *   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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