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;
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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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**   ****  *  * **   * * ****   * 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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}
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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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0 0
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;
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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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