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[]){
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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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  * ** *** * ****   **  *****   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;
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*     ** **  **  * ** **** *     len = strlen(a);
 * *   *** ** ** *  **  ***** = 0 ; i < len ; i++)
** * ***           *   *** ** 
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***  ***    *      ***    **   *    *****  ** ** * * ***
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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;
  ****   * **  * * *   *   **
 * **  ** ** *  ** *** **  ***
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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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