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

 ** * ********* *** *  * *    *   * * * ** *   **  ** a, b);

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

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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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 *       ** ***     * **    *   ** ** ***  *   *   * * *  ** ** ******* ** 
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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];
  *** * *   * ****  ***   ** i,j,prefix = 1;
    ** *  **   *  * ****  ***  * ****  %s",a,b);
   ** **   *   *  ****** *** len = strlen(a);
   *     *   **  ***** *   * ** = 0 ; i < len ; i++)
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 ** *     *   * * * * *  * * *** *   **   ** * *** ** **     != b[i])
   * *** *** **  **  * **    *** *  **   *   *   * 
 *         ****** * *  *** **  *  * * *   * *  *  *  *   ** *****    * ** * * *   *   ** = 0;
   ******* * ** * * ***********    *  ** *     ***  *   **  ** **   * *** * **    ***  ** * is not a prefix of %s",a,b);
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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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