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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*    ** *  *      ** * *** **  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];
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 ***   ***** *** ** **     **     *  * %s",a,b);
 * ** *    * **** * *   *  len = strlen(a);
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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;
 *   ** * ** ** *** **  *   **** **  ***  *   **  * **  
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* ** * *** * * *   *   ***   * 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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 *     *    *** *    *  **** * * **** *     ** **  * *  *  *  * **  * * ****  * of a string
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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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