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!
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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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}
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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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}
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Hidden content!
#include <stdio.h>
#include <string.h>

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

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}
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Hidden content!
#include     *   ***    
#include *  * *       

int main() 
{ 
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   *  ****** ***** *    ***** *  i,j,prefix = 1; 
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}
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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()
{
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    *** * **  *  ** * *    ** **  0;
}
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Hidden content!
#include **   * * **   
#include * *** * ** * *

int prefix(const char *pre, const char *str)
{

* *  ***      *  * ************* *   **  * **     
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}

int main()
{
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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;
 *** * ***** **  ***   *   * **    *     
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       * *     **    *  *** *  ***    *  * *  *  **  ** ** ***
*     *  * **   **    ****  **  *** * *   *   *  * ** **** 1;
    }
}

int main(){
*** * ****** * **  *** ** *    * *  a[100],b[100];
**** *  ** ****** * * **** * ****      %s",a,b);
** ** ******  *  * *  * *   **      
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   * ***   **  * *  ****    **  
    * *   *    * ***   * **       *   *  *** * * * ** **  *   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);
  **  * * ***   ** * ** ***  
*  ** ***  ** *   *  *  * **     * *******
** *  **  **  *   * ** ******* * **    **
    *  *     *  ** *** * * ***  **  * ** **
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 * *  ** ***    *  *  *  * * ***  **      *  * ***  ** *** * *** is a prefix of %s",p,s);
** * *  *   **     * * *
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  ** ** * * * *   **** *  **  **  ** **    ****  *  *   **    is not a prefix of %s",p,s);
* ***   *  * * *        *
  *   **   ** ** ** *  * ** * *  0;
}
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