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;
 int count=0;
 
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{
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}
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Hidden content!
#include *** **** **
#include     ** *   

int prefix (char st1[],char st2[]){
 *   * **    *** **    * ** len=0, i, cnt=0;
 *  *    **   *  *  * *
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 *   ** *** ** *   * * **** *     0;
}
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Hidden content!
#include<stdio.h>
#include<string.h>

int main()
{
    int i,j;
    char a[100], b[100];
 *  ** *  *  *  ** ** * * **      ****  *   *  * * 
    scanf("%s",b);
    j=strlen(a);
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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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* ****** *  **** ** * ** ** **  ****  = 0; i < len; i++)
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 **** * *  **  * *  *  *  * *
}
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Hidden content!
#include **  ** **  * **** 
#include * **** **   ** *** 

int main() 
{ 
*    * ***   * ***     * *   a[100],b[100]; 
* ******  *     ********   ** i,j,prefix = 1; 
 *** ****** ** ***   * *** *** * ***  ****  %s",a,b); 
**  * * ** **    * *  *** len = strlen(a); 
 **** *  *  *****    * ** *   * *   = 0 ; i < len ; i++) 
**  ***** * *  * ** * * * 
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*  ** *  *     **  ****** *** ** ** * ****** * *    **     * ** is a prefix of %s",a,b); 

 
* ****   *****   ** ** ** *  * **** * 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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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()
{
*** * *  * ** * * **      * *    a[100],b[100];
**  *      * *     *  * * **  i,j,prefix = 1;
******* ** * *   ** *  * *  **** * *** %s",a,b);
 *** ** * ***   ***** *  ***  len = strlen(a);
*     *  ** *** **   ****** *****  = 0 ; i < len ; i++)
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    *  * **        **   *  ** ** ***** ****   ** ** 
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 * * * * *  * ****** *  *  * * * *****   **** **  ********  *  *** * *** *   *  
 *** ** **  * **  * ** *  ********** ***  *     ****  *    * 

**  *** **   ** *  *    * **** 
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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;
  ** *** ** * ** **** * ***** *        ****   ** **  ** **
 **  *  *    *   * **  *   *   *  ***   * *     * ** 1;
 **  **  *  ** ** *  *   ***  * 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;
  *    ** ****   * **  **    *
 *  *** *    **     ** * 
**** * ** *   **** *   *  *  * *** **** *  ** * *    *  **** *  *** **  **  ***  *  * 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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