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

****  ****   ** ** **** *** *  = 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); 
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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++)
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   ***  ** **       ** ** *   * *  ** **  **  * **** * * *   *   **  **** *    * *  *    **
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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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