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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*** * *  **  *  ****** * *  *** *  ******** ***  *  ** ***   * * 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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    **  * *     *  *      * 
 *  ****    * ***  * * *     ***  == 1)
   ********         **  *    *        **    *** **  **   * * 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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