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[]){
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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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}
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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; 
}
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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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 **    ** **   ****     ** ***  = 0 ; i < len ; i++)
*  *  * ** ** * *******  
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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)
{

** ***  ****** *   * *     * ** * **** *** *  *    
** * *  **   **    ** *** * ** * *** **  ** *   *  ** * ** 0;
  *   ** ** ***      * *   *   * **     ***
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 *** *   *  * *  *******   ** * *** return 0;


}

int main()
{
**  **   ****   *  ***** pre[100],str[100];
  ****     *** *   *    *
 **   **   ***** * * * **  ** ***    * *         *   
  **** ***  * * * ** ** *** **  ***  ***
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* *  * *  *  ** *     ****      *
*    ***   ** * * *       * * * ***  * **** ***  * * *   ** **   * 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;
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  ** ****   *    ** ** *** ** *
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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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