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[])
 {
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Hidden content!
#include * **  **** 
#include * ** * *      * 

int prefix (char st1[],char st2[]){
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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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  ** * * *  *** * *      *  
}
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Hidden content!
#include *   * *  **    * *  
#include **** *  ***    

int main() 
{ 
* **    *** *  ***     **  a[100],b[100]; 
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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;
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 ****  * * *   * * ***   *  = 0 ; i < len ; i++)
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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];
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 * ******  *   *      ** * ** *****   *    ** **
 * *    * * *    * ***   * *   *     *  *  
  *    *********      * *  *        ***    ***  *  ***   * * * * *  * ** 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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