Functions in C

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C++

C

programming

I wrote a program which calculte the power of a number
example 2^5 = 32

program

#include<stdio.h>
#include<conio.h>

void main(){
	int a,b,c;
	int power();
	printf("base value : ");
	scanf("%d",&a);
	printf("power value : ");
	scanf("%d",&b);

	c=power(a,b);
	printf("value of a power b =%d",c);
	getch();
	}

when i compile this program an error comes
Error at line 12 : Extra Parameter to call power()


But in this program no error comes

Program

int power(int x,int y){
	int k,l,m=1;
	k=x;l=y;
	for(int i=0;i<l;i++)
		m = m*k;
	return(m);
}
void main(){
	int a,b,c;
	
	printf("base value : ");
	scanf("%d",&a);
	printf("power value : ");
	scanf("%d",&b);

	c=power(a,b);
	printf("value of a power b =%d",c);
	getch();
	}

I think there is a problem in function declaration in 1st program.
but according to book function can be declared without specifying arguments. So i declared as "int power();"

Please tell what error means and where is the problem.