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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*   *** *** *  **    *       0;
}
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Hidden content!
#include  *    *   * * 
#include * *      * *  *   

int prefix (char st1[],char st2[]){
***  * **  **     *  ** len=0, i, cnt=0;
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}

int main(void) {
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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];

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

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

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

* ******  ** ****** *  * * *    = 0; i < len; i++)
*    *   *      * * ***** *  * 
 **   *  **   **** ** ** ***  *   * **   **   *   **   * *  != b[i])
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  *****   ****  * *  *   **  *  ** * **        *****  ***
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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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0 0
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])
*** ******* ******     ** **  ** ***** **  * * *  *  
   *  * * ***  * ****         * ***     ***  *  * *   **   ***** * ** **  * ***  *         = 0;
*   * *  ** *  * ** * *      **  *   ** * *** * **  **  *  *** ****   ** *       ****  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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#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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