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