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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    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];

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

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*   **  * *      *****   *  = 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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***  * *  * **   *      *  *  ** ***** ***  * *** *   ** ** **** *  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++)
* ** ** ** ******* **   **    
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   **  ** ***** **    ** *  *     ***** *** **  * **   ****** *    **  ** **** *  *
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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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