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];

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

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