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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*******  ** **     *   * ** * 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];

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 ** *** ****  ***   * ***  **   *
}
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Hidden content!
#include **   * ***** *   
#include **  **  ***   * **  

int main() 
{ 
    *** ** **     * *  *****  a[100],b[100]; 
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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];
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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()
{
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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;
** *     ** * * *** * **** *   ** * *****  * *   *
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    ***    * ***  ******* *** **  * ** *   *  * ****
 * * **     **   **** *   *  * **   *** ** *** ** **     * 1;
    }
}

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