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

int prefix (char st1[],char st2[]){
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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)
{
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    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() 
{ 
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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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}

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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    }
}

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;
  *         *  *  * ********* ***  *  
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 ** *** * **  *  * *       *** * *** *** *** *    %s",p,s);
   ****   *****  * **   ****     
** * *  *   **  *  *   **   * *  
*   * *  *  * *      ************  **
*  ** *     **  **  *  **  *    *      *  
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  * * * *    ***  *    * **   *  **  ** * ** *  ** ***** *** ***   *   ***   is a prefix of %s",p,s);
* *  *****      *** *  *  * 
* *  ** * * * ** * ** * ** *** **
** *   *  *** **  ** *   * **     *****   ***   * ***   **  * *   is not a prefix of %s",p,s);
**** * ****     *     *** **  
 *    **    **  *   ** *   *  0;
}
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