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

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    *     **    *    ** *     
}
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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 ; i < len ; 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];
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 * **  * *  * * *  *   *      **  * ** ***   %s",a,b);
 ***    * **   ****   *  * len = strlen(a);
   * ****  **** * *** *  *    = 0 ; i < len ; i++)
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  * *****  *   ***      **  *   *****  *****  **   ***** 
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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;
 * *****  *  ****    *   ***  **   * *  *  ** * 
**   ***  ** *    *   **   *   *  **    *** * **** *      *  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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