Thread: need help proofing a simple program

it seems fine to me...
it's probably something stupid.
syntactic maybe.
but i can't find it...

the program's supposed to accept a float and round it up or down depending on the float.
it's also supposed to determin whether the float is a true decimal fraction or just something like 4.0

here's the code

Code:

#include <stdio.h>

int output, run=1, frac_mod, reduce( float input);
float input, decimal;

main()
{
	while(run=1)
	{	
		printf("input a decimal fraction:\n");
		scanf("%f",input);
		
		frac_mod=reduce ( float input);
		
		switch(frac_mod) //this is where the actual rounding is done by assigning a float into an int
		{
			case 2:
			{
				output=input+1;
				printf("\n%f is rounded up to %d\n",input, output);
				break;
			}
			case 1:
			{
				output=input;
				printf("\n%f is rounded down to %d\n",input, output);
				break;
			}
			default:
			{
				printf("\n%d is not a decimal fraction...\n\njackass\n",input);
				break;
			}
		}
	}
}

int reduce( float input) // determines which way to round, and whether input is a true fraction
{
	decimal=input;
	
	while(decimal>1)
	{
		if(decimal>100)
		decimal=decimal-100;
		else
		{
			if(decimal>10)
			decimal=decimal-10;
			else
			decimal=decimal-1;
		}
	}
	if(decimal>=0.5)
	return 2;
	else
	{
		if(decimal!=0)
		return 1;
		else
		return 0;
	}
}

the compiler says there's a "parse error before float" in line 13 of the code.
where the function reduce is first called.

do you see a problem ?

also, if you see any other problem in the program please let me know...
as i understand it a code can compile perfectly and still not a working exe make...

so any input is appreciated.