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;
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}
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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()
{
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*  ***      **   *      * *    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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 **  *      *  *     ** *   *     *   *  %s",a,b);
 **** *   **   *   * * *****  len = strlen(a);
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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()
{
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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;
****  * * ********   **** *
*  ***    * *      *** **  ** *
 * ***  * *       * ******  *  *  **** * *** * *    *  * ** * *      ** **  *  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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