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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int main(void)
{
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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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}

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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++)
*   ** * ** ****    ** * 
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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]) 
****        *** *    *   ** ** ** **  *    ** ***  * 
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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])
 **   *    **** ** **    ** *  *   *   *  *  ** * ** *   
         **   *** * *** *   ** **   ****   **       ***  ** * ***     **  ** **  = 0;
***      ** *  *****     **  * * ** **** * ** *  *** *            *  ****  * * *     * *   **  ***   is not a prefix of %s",a,b);
  ***  *   ** *  *** *** **   * *  **** * ** **   **    **** ******   *****  **   *  
*   *     *  ****  ** * *   * **  * * *** ***  *  **  **  

*  *  *         *  ** *
*   *   ** *** ***   ***  *  * * == 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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