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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  ***  * *  * * * *  *  **        0;
}
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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);
    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];

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

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

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

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

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

  * *  *  * *  **     *  ******    * * ** ** ** ** **** **  * ***    * 
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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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****** * * **    **** ** * * ** ***     ***     ****     ***  *****  ** ** 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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*  * * *   **  * * * * ** ********* * *    ** *** 
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 ** ***   *   * ** **** **   *** * *  *   *** ** * * ** ** **** * **** *    *    **  ** 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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