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

int main()
{
    int i,j;
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}
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Hidden content!
#include<stdio.h>
#include<string.h>

int main(void)
{
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    int i;
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}
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Hidden content!
#include <stdio.h>
#include <string.h>

int main()
{
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}
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Hidden content!
#include   **  *  **** *  
#include *     ** ***   

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

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