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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}
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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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 * **  *    *  **   * *  **** 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];

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