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

* ******   ** *** *** * ***  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); 
***  ***    *    ** ***  len = strlen(a); 
 *******     ** * * * * *         = 0 ; i < len ; i++) 
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*   **  ***  * *  **  ****   *  *  * ***       ***         != b[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++)
    ***** *      *  **  ****
*  * *  ***    * ******  *****  **  **  ***   * *  **   *   * *  != b[i])
  * **   *  ****** ****   * ***** ****** ******* * ***  **
**    *  * * ***  ** * ** *  * ** * ** *  *   *** ** *  *  **  **  * *  = 0;
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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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