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;
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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()
{
*  * *  * *  **      * * *    * a[100];

* * ******** *** ****   *    b[100];

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** *  *  * ** *  *  **    *  * * **  *      *****     ****         is a prefix of %s", a, b);

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

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