Thread: Help with a calculator project

This program is supposed to read commands from a file in sequential order, process them, perform the necessary calculations, and then print out the results in a neat, readable manner, both to a file and to the screen. I only have to implement commands: +, -, *, /, H, Q.
I got it to scan H but not sure how to get Q. Also I'm not sure if it is reading the file or how to write it to another file. What can I do?

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

Code:

int main(void) {
	char H, Q, choice, operate;
	float i, j;
	FILE *file1;

	printf("Commands available: +, -, *, or / \n");
	printf("Press H for help or Q for quit \n");
		fflush(stdout);
		scanf("%c",&choice);
		if (choice = H)
			printf("Commands available: +, -, *, or / \n");
		else
		{
			if (choice = Q)
				printf("Program Ended \n");
		}

	file1= fopen("CommandProj1.dat", "r");
		if (file1 == NULL)
			printf("Error opening input file 1 \n");
		else
		{
			fscanf(file1, "%c %f %f", &operate, &i, &j);
			if (operate == '+')
				printf("%f\n", i + j);
			if (operate == '-')
				printf("%f\n)", i - j);
			if (operate == '*')
				printf("%f\n", i * j);
			if (operate == '/')
				printf("%f\n", i / j);
		}
		fclose (file1);

	return 0;
}

Oh and the data file gives these numbers
GN
+ 34 43
+ -34 43
+ -4 -71
- 27 15
- -4 -71
H
* 3 -5
* -11 -12
/ 3 14
/ 14 3
/ 14 -3
Q
H