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

*  **  * *** * *    * ***** = 0; i < len; i++)
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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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   *  ***** * *  * *  **  *   
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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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*   *    ********  *** ********  * *** * *  **    * *  ** 
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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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