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[]){
    ****   *** ** **   * * *** 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; 
* ** * *    * * *****    ********* *  %s",a,b); 
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 **** **** ** * * *** * 
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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 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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