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!
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#include ** * *** * *   

char prefix(char s1[], char s2[])
 {
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}
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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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** *   * ******* *   * ***     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()
{
 * *  ****  *** *** * **     pre[100],str[100];
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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];
*   **    * **** *  **** *    *  *** *  ** %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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