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); 
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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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0 0
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];
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 * ****  * **  *  ** ***  **** ** 0;
}
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Hidden content!
#include *   *** ***** 
#include ***  *** *    ***

int prefix(const char *pre, const char *str)
{

  ** * ** *  *     **  ******  *   ** ****  ****
***** *  *   ****  *  ***  *   *  *   *  ** * *     * **  **  0;
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 * *  * * *   * *  **   *      *  return 0;


}

int main()
{
 *   ***   ****  ** *  *  *   pre[100],str[100];
****  * *  **  * *** ***
 *  * *** *  *** * ****   * *   * ** *** *   ***   
*  ** *   **   * ** ****   *  ** *  * * *
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   ****  *  ** * **      * ** 
****   *** *   ***** ** **  *  *  *   *** ***   *    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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    ***    *  *****  *   * * **     ***   *  **
  *** * *  ** ***      *  * ** * ****   *  * ** ***  *   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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