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.

but my problem is that I couldnt find a way to make the program so that you actually have to input the +, -, *, and /.

What do you mean by this? Do you want the user to just enter in something like "1+4", and your program would output "5" as the answer? Or you do want to do something like, "Enter the operator to perform on the 2 numbers", and your program would use that operator on the 2 numbers entered.

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?

Originally Posted by Justinjah91

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?

It makes perfect sense, but it is not an easy problem. Read this thread for some insight.

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