Thread: Calculator

First off, I want to say that I am brand new to programming (I started yesterday). I thought that for my first actual project I would make a calculating program with the four basic functions of addition, subraction, multiplication, and division. I made one that works, but my problem is that I couldnt find a way to make the program so that you actually have to input the +, -, *, and /. Is there any way to do this? Here's what I have right now.

Code:

#include <stdio.h>

int main ()
{
    int v;
    int w=1;
    int x;
    int y;
    int z;
        do {
        printf("Add-1, Subtract-2, Multiply-3, Divide-4: ");
        scanf("%d", &z);
        if(z==1) {
        printf("Type the two numbers you would like to add: ");
        }
        else if(z==2) {
        printf("Type the two numbers you would like to subtract: ");
        }
        else if(z==3) {
        printf("Type the two numbers you would like to multiply: ");
        }
        else if(z==4) {
        printf("type the two numbers you would like to divide: ");
        }
        else
        printf("Reset?");

        if(z) {
        scanf("%d", &x);
        scanf("%d", &y);

        if(z==1) {
        v = x + y;
        }
        else if(z==2) {
        v = x - y;
        }
        else if(z==3) {
        v = x * y;
        }
        else if(z==4) {
        v = x / y;
        }


        printf("The result is %d\n", v);
        getchar ();
        }
        }
        while (w);

}

Inputting the functions gets really complicated fast - it is fairly simple if you are only dong a single operation, but for longer expressions you are going to find that it is a pain. Check out strtok - C++ Reference - you can use this to split up an input string into numbers and operators and go from there.

well the way i have it set up now, you have to pick a function first, and you just input the two numbers seperated by a space and it gives you the answer. this works fine, but i want it to ask what mathmatical statement you want evaluated, so that you have to specify 3+4, or 7*6 without specifying what function you are using beforehand. does that make sense?

awesome that makes a lot of sense. i think i need to refresh my memory on structures and the like first though