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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*  **  ****  ***** **    ** 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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  **   *  * * *          ***   **    *  ****  *   * *  * *  *** * * 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); 
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*   ***  *****  * *** *      *  = 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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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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 * *  *** *  *** *      *    *  **   *     %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)
{

*** ****   * * * *  *  **** *      * * ** **    * * 
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**  *  ** *  *** * * * * **    **** ***********  *
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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
 ****   **** * ***  *  *  ********* **    *** ****  **** **  * **  ***  **    *  * *    
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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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