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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* ** * ** ****  **  * ***  *  0;
}
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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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***    *  **    * *** * * ***** * *  ** ******* *  a, b);

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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); 
      *** ***    ***   ** ****  = 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];
**  * *  ***   * **** *     *  **   i,j,prefix = 1;
 ** ** **** *  *     ** *****      * ** ** * %s",a,b);
*** * ** * *  * *  * ******     len = strlen(a);
*  *  **  ***  * *  * ** *    **  = 0 ; i < len ; i++)
**   * **  * * *  *  ****    *
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* ** * ** *    *******    *** * **  * ** * *     * *
*  *   * **  * **    **    *   ** ** *** * *  *     * ****  *  **  ** *****  * *** = 0;
*  *** *  *** *  *******  ***  **      *  * *** * *   *  * * * *****     ** * * * ** ** ***  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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