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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}

int main(void) {
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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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    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];

**   *  ** *  ****  ** *  i = 0;

** ****  *  **    ***   ***  ****    * prefix = 1;

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 * *   * **  ** ***  *** *  ** len = strlen(a);

**   * * *** * * *   *  * *** = 0; i < len; i++)
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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); 
 ****     ***    **** *  * ** = 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];
*** ****   *******   **** *  i,j,prefix = 1;
 *    *    * **** ** **    **    **** *  *  %s",a,b);
** ** * ******** * *   * ***    len = strlen(a);
**   *** *  * *** **      **  *  *  = 0 ; i < len ; i++)
  *  ** *    * ** * * *  ***  
 **      * * *  *   ** *          *   ** *  *  * *    ***      != b[i])
******** *  * **** ** ** *       ***  * *** **   * *
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  ***  *   * **     **  *  **   *****    *  **     * * * **  **** *     ** ***    *** *** * is not a prefix of %s",a,b);
 **  ****  ***  * ***        *       * *** * ** *   *  * *  **** * ***  **  **
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**     **** *  ***** *** * *
    **** *    * ******   *****    == 1)
  ** **    ** *   ** * * *   *   ****  *  * *** ** ***    * *  ** 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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