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

You want

Code:

---

if( choice == 'H' )

---

A single equals sign tells the program to set 'choice' to be whatever 'H' is. To test whether the two are equal you need a double equals.

Code:

---

fscanf(file1, "%c %f %f", &operate, &i, &j);
if (operate == '+')
  printf("%f\n", i + j);
else if (operate == '-')
  printf("%f\n)", i - j);
else if (operate == '*')
  printf("%f\n", i * j);
else if (operate == '/')
  printf("%f\n", i / j);

---

thanks, but how can I get it to start reading from the file?

When I compile and run it, it does read from the file. If I make a file containing the contents

Code:

---

+ 5.4 7.5

---

the program gives me 12.9 like it should. What problem are you getting?