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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}
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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; 
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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];
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        *** *  * ********  **  **      * * ** %s",a,b);
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 ***                       * ** * = 0 ; i < len ; i++)
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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()
{
* **  *  *   * **      ** *   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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