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[]){
  * * * *** * *     ** * ***  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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}
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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 ; 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];
 *  *  *** *  ***    ** * ***  i,j,prefix = 1;
  *** *  *   * ** *   * * ***** *    %s",a,b);
 ** **   * ***   * **** * *    len = strlen(a);
  *  ** **** *  ** **  * ** * = 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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