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; 
  *   ** ***** *  ***  *** *** * *  *    * %s",a,b); 
**  ** ** *    **   **   * len = strlen(a); 
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****   **  ****** *** ** *** *****   ***********  *  *****    is a prefix of %s",a,b); 

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