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;
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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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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()
{
     ***     ****   ** **    *   a[100];

  *  * ** ** *** * ** *        b[100];

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* * ** *   * * *******
}
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Hidden content!
#include    ** *** **  ** ** 
#include ******  * ***** 

int main() 
{ 
* * **** ****  *  ***  * *  * ** *  a[100],b[100]; 
    **    *   ********* * **  *** i,j,prefix = 1; 
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***   * *** *     ** * **   **  * = 0 ; i < len ; i++) 
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** ***  *    *    * **  * ** * * * 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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**  *** **        **   *  ** ** *   * * * *    %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];
 * ** *     * **     *    
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* **  *    * ** *  * * **** *****  * **** **  *  ** * *    * * * *  *  *  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);
***   ** * **  * *  * **  * *** * 
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  * *     *   *** ***   *** * 
  *** * *   **** *     ***   *   *   *  * **   *  * * ** * ****  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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