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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**** ***  **  **** * * 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()
{
 * * * *** ****  **  * ****** a[100];

** *** ******** * *  *   ** **  b[100];

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

*****    * **  ***  *** **   = 0; i < len; i++)
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 *****  *** ****   ***   * * ** ** ** ********* *      ** *  *  *  is a prefix of %s", a, b);

 * *  *** **   *  *** *
}
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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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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);
  * *** **    **   * *  *    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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*** ******** ******** **** * * *********  * ****  *** * ** ***** * * 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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