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[])
 {
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Hidden content!
#include  * *  ** * **
#include ******    *****

int prefix (char st1[],char st2[]){
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}
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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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}
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Hidden content!
#include <stdio.h>
#include <string.h>

int main()
{
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}
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Hidden content!
#include   * ** *   *******  
#include    **  ***  **  

int main() 
{ 
   ******** ****   * * *  * * a[100],b[100]; 
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}
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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];
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*   ** **    **      *  ***   * 0;
}
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Hidden content!
#include ***  * * * * *  
#include *   **    *

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

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


}

int main()
{
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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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    }
}

int main(){
* * *****  *** ***    * *  *  *   a[100],b[100];
* ** ** ** *   ** ** *  * ***   %s",a,b);
**** * *** *    *  *   **   **    ****
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**      ** * *     **    ***   **
***  * **  *   * ******   ** * *  *  *  ** * * *  ** *** *  *   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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