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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 *  ***   * *   *   * *  * **** * 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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}
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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()
{
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     **  * ***    ****  *  ***   b[100];

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