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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*  * * *  ** * * *  * *  
}
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Hidden content!
#include    *  *  ***  **** 
#include **    **  * *** 

int main() 
{ 
** *   * ** *  **   * * * **  a[100],b[100]; 
    **     *  **     **  i,j,prefix = 1; 
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 *   **   ** * *  ** *** ****** 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];
 ** *****  * ****   **  * * * *   i,j,prefix = 1;
******  * *  **   *****  **** * *  ** %s",a,b);
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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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