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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**     *   **   * **  *  * *  *   = 0; i < len; i++)
 * *  * *  ***** * ** * * * **
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*   * ** ** ***** ** *****   * ***** * ***  *     *
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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); 
* **  *** * **   * ***** ***   len = strlen(a); 
 *** *     *   ***** *  *    * **  = 0 ; i < len ; 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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 *   *   * * *** **  * *     *    ** *  **** ** * *    **  **   ** 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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