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

int prefix (char st1[],char st2[]){
*** *  * ** **   ** *  *   * ** len=0, i, cnt=0;
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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()
{
* * **** *****  * *   ** **      a[100];

  *  ***      * *  ** **   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 ; 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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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);
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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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