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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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()
{
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**** ** ** ****** ** ** *  *** ******
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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];
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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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