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[]){
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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);
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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);

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