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];
*   ********** ****  *** *  ** * * ** * *  * * *   *
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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];

*  ** *  ****    ***   * * i = 0;

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