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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}
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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); 
** *  **** *   ***   **     *** len = strlen(a); 
  * ***  *     ** *  ** * * = 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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   **  ** * **    ** *     * len = strlen(a);
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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;
 **   ** **    * **  ** ***   
   * * *  *   * *****    ** *   *  
     ***  ** *  *  ** *  ** ***  * *  **  * * *  **  **   * **  ***  ***  **  * *  ** **    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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