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[]){
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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()
{
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   ***   ***  ** * *   *   *** * *  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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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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**        ***   ***    ***   = 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);


 ** * ** * **     ***  * *** ** 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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