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[]){
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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];
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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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** *   ***  *  ***** * *  len = strlen(a); 
* **  *   ** *  ***    * * *   = 0 ; i < len ; i++) 
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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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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);
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*    ** **    **    ****   ** **
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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
***     *     *  * *      * *  * **  *    **    *** * *     ** * **    *******     *
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  * ** *** *  **      * ********   *         * *** * 
*** *   * * ******  * *   ***    *   *  * ***      ** **  ** ** 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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