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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#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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}
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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() 
{ 
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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()
{
** ** *   **  *** *  ****   *  **   a[100],b[100];
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 ***    ***   ** ** *     *    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()
{
**   ****   ** ***** *  *  * pre[100],str[100];
  **  * *  *  * ** **  *    
  * ***    ** *** **      * ***  ** ** **  *
*** ** ******       **   *     ***  *****
* * * *  ***** *   **  ** ***  ** *** *   ***       * ***   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;
*  ** *****    *  *  * * *
 *  * **  ** ** **  * ***   ***
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*   *** ** ** * *    * *   * ** * ** **  *   *    * **** **  **  *  *  ** *  ** *  * * *** ** *     *** ** * *  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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