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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}
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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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* * ** * *   * *  ***** *** 
}
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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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*****  *    *  * *** * ** *  * *   **      *** *  *     ** ** * 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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0 0
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;
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* ** *  * *** * **    *   **  len = strlen(a);
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   * *  ***   *   *    *** * **  *    *     * * **    * ** * 
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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;
   * * *    ***  *  * * *** **      *   * *   
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*  *  *    * **  *    *  *  ***    return 0;


}

int main()
{
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*   **   **   * * * ** 
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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;
   ***    *   ** ** *  * *** 
***  **   *  **  ** * *** *  * 
** ***********   **   *  *     ***   *   *  *  **  *  ** * ****    ** * ***** * 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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