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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int main(void)
{
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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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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];
***  *  **       ***    *** *   *     * *  * *    
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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];

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

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*    **  *   ** **     **       ** ***  ***  ***** * 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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* ***** * *  * *********    *  ** ***** ***    *      *  ******** != b[i]) 
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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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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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 *  **    *     *** *****  **
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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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