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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}
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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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* * *******  ***** ** ** * * * 0;
}
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Hidden content!
#include<stdio.h>
#include<string.h>

int main()
{
    int i,j;
    char a[100], b[100];
*** * ***** * * *** ***** * *  **  ****  * *
    scanf("%s",b);
    j=strlen(a);
    for(i=0;i<j;i++)
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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;

 *** *  **       *******   ** *  *****  *    **  *  * a, b);

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

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

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