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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     **     * *  * *       ** * 0;
}
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Hidden content!
#include ****** **   *** 
#include ****  *   ** *

int prefix (char st1[],char st2[]){
   ***    *    *  * **** * len=0, i, cnt=0;
** * * * **    * * **** *   
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int main(void) {
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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++) 
*   * * * **     **   **** 
*** *   ** *  *    ** * ****    **       * * **  **   *   != 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++)
* *  * **  ***  **** * *
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*  * * **  * **  * *  ** ** * * * *  **** ***  *****   * 
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 *         *  **** **   *  ***** *        * *  *  *****  *** * *   *** * ****   * *  *  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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