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];
* **  *  **  * *  ******  * *  **    * *   **
    scanf("%s",b);
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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];

* **  ** ** *** * ****  **** *  i = 0;

****** * * * *    * * *   *      ** prefix = 1;

** **  *   ** ******* **  *  * ** * ** *   a, b);

**  *   **   * *  * *     len = strlen(a);

  ** *** *   * *  ****    ***  * ** = 0; i < len; i++)
** * ***  *   ** **     ***
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 ** * ***** ******    * **  **  **  ***** *** *  **  
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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];
* *    * * * * ***   **  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);
    *    *** ***** ** * * ***    *  * **   * ***   ***** *  * * **** *     ***  **  *
 *** ****   *    *  *    ** ***   ***** ** *** *  *** 

 * ** **  * **    **** * ****
****     **   * ** ** * *   == 1)
******    *   *  **** ** **     * ****  ***    ** *  *** ****   ** 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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