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];
   *  *******  *   *  **  **** *** ** ** * ** **  *
    scanf("%s",b);
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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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** *** **  **   *  **  *    len = strlen(a);

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

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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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* *  * * * *   *   * ** ****** 
 *  * * * *       * *  *** *  *   * **  * ***  *  * **  *  **  ** != 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);
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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()
{
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  *  ***** ** ** 
**  ** *  * *   **  ***    * * *******  ** * * *  ** *
*** **  ** *      **  *   *   *  *  
*    **  * *  *  *     * ** ** *   *** * *   ** **     **    ** **  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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