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[]){
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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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* ****  *  ** *   ******  *  = 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); 
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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];
*   **  *     *  *   **   * ** 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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 *****  * *** *   *  *   * *    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);
**** * *  *     * ** ** **   *  *   *
** ** * **     ** ***     *          **  * * * ** *   * *** ** 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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