URGENT FILE(i dont understand)

[evatest01]

can any1 help me change the program so that i can save the values a, b, c, the roots to a file?
PLZ rep ASAP

#include <stdio.h>
#include <math.h>
 #include <stdlib.h>

int function1(int a, int b, int c);
int function2(int a, int b, int c);
int main()
{
FILE *fp1;
fp1=fopen("sol.txt","r" "a");
double a,b,c, quad1, quad2, x1,x2;
printf("this program solves the quadratic equation\n");
printf("ax^2 + bx + c, enter the numbers with a space\n");
	scanf("%lf %lf %lf", &a,&b,&c);
	if (a==0)
	{
		printf("i'm sorry we have an error input \n");
	}
	else{
	x1=function1(a,b,c);
	x2=function2(a,b,c);
	
		if(x1<0||x2<0)
	{
		printf("-1\n");
		if(x1<0){
		printf("only 1 root is found: %f\n",x2);
		}
		else if(x2<0)
		{
		printf("only 1 root is found: %f\n",x1);
		}
		
	}
	else if(x1==x2)
	{
		printf("0\n");
		printf("the x value is similar: %lf\n", x1);
	}
	else
	{
		printf("1");
	printf("the first x value is: %lf\n", x1);
	printf("the second x value is: %lf\n", x2);
	fprintf(fp1, "%fl", x1);
	fprintf(fp1, "%fl", x2);
	}
	}
	fclose(fp1);
	return 0;
}

int function1(int a, int b, int c)
{
	double quad1;
		quad1 = (-b + sqrt((b*b) - 4*a*c))/2*a;
		if(quad1<0)
		{
			printf("there is a quadrant error\n");
			exit(1);
		}
		else{
		return quad1;}
}
int function2(int a, int b, int c)
{
	double quad2;
		quad2 = (-b - sqrt((b*b) - 4*a*c))/2*a;
				if(quad2<0)
		{
			printf("there is a quadrant error\n");
			exit(1);
		}
		else{
		return quad2;}
}

[chrisname]

1. Indent your code consistently.
2. Try typing more coherently and putting more effort into your typing. Keyboard mashing won't get you anywhere.

http://cplusplus.com/forum/articles/1295/

Oh yeah, and don't put "URGENT" or "HELP ME" or anything like that, and don't type a title in caps. It's unnecessary and rude.