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[]){
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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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    *  *   ** ******   * *  *
}
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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;
****** * **    ** *  *****   ** ***  ** *    *** **  
** * ***     *    * ** * ** **    *              **  * * **** 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;
   ** *** ***   * * *    
*  **** * *** * * ** ***** * *
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  *      *** **    **   *  *** ** *  **   ***   *** * *** **        **    *  **   *** * ***   **  * *****  **    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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