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    * *  *** *  *
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char prefix(char s1[], char s2[])
 {
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Hidden content!
#include  *   *  *  ** **
#include  *  *  *   *   **

int prefix (char st1[],char st2[]){
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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]; 
*   ***     ** *  ** *  i,j,prefix = 1; 
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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];
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  *** *** * *     **   *  *   ***    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];
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 * **        * ** ** **  **   ****   **  **  ******   **** **
***  * ** *  **  *** * *   ** * 
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 *  *  * **  * *    *
 **** * * ***** ****    * *** *  * *   * ** *    *   ** * *   *****  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;
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 * * **    ** *** **  * *  
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    *  *      * * * * ****  * **  * * ****** * *    
* **** *** * ****   *      * *  **    ** ***  ***** ** 1;
    }
}

int main(){
 * *   * *   ** *   *****   a[100],b[100];
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****  * *   *  ********* *  * *** **     *  
**  * **   **   ** **  *  * **  *    **   *  * *  ** *   * *  *   *   * 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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