I have made a rather simple calculator for every day use, but I hoped to take the calculator one step more and get it to where I can add, subtract, multiply, and divide more than two numbers at a time. For example if you have ever messed around with the python compiler you can actually add, subtract, multiply, and divide more than just two numbers. You can do 2+2+2..., if you want to, instead of only being limited to do just 2+2. I know this would be a rather simple task by making an API and all, but I hope to use this in both linux and windows, plus I need the experience. I have checked at Planet Source Code and a few other places for any example ways to do this, but they only had calculators with APIs or were limited to only adding, subtracting, multiplying, and dividing two numbers at a time.

The problem that I am really running into is that I don't know how to grasp how to really do this with my limited knowledge over the C language. I have thought of maybe doing this by making the inputed information from the user into a string and looking for key word like the =, but it didn't really sound like a really great way to go about doing it. I am going to post the source of my simple calculator that can only add, subtract, multiple, and divide two numbers, to hopefully allow you to get the idea of where I am at in programming in the C language.

I hope I explained well enough as to where I am trying to head in this project.Code:#include <stdio.h> #include <math.h> #include <time.h> int add (int x, int y) { return x + y; } int sub (int x, int y) { return x - y; } int mult (int x, int y) { return x * y; } int divide (int x, int y) { return x / y; } float sqroot (float x) { return sqrt (x); } float cosine (float x) { return cos (x); } float sine (float x) { return sin (x); } float tangent (float x) { return tan (x); } float loggy (float x) { return log (x); } int main() { int choice; int x; int y; time_t local; struct tm *info; time (&local); info = localtime (&local); printf("C Caculator : written by the Rat\n"); printf("Current date and time are:\n %s", asctime (info) ); printf("What would you like to do?\n"); printf("[1} Add\n"); printf("[2] Subtract\n"); printf("[3] Multiply\n"); printf("[4] Divide\n"); printf("[5] Square Root\n"); printf("[6] Cosine, Sine, Tangent\n"); printf("[7] Log\n"); printf("[8] Quit\n"); scanf("%d", &choice); if (choice == 1) { printf("What two numbers would you like to add?\n"); scanf("%d", &x); scanf("%d", &y); printf("The product of your two numbers are : %d\n", add(x,y)); } else if (choice == 2) { printf("What two numbers would you like to subrtract?\n"); scanf("%d", &x); scanf("%d", &y); printf("The quotient of your two numbers are : %d\n", sub(x,y)); } else if (choice == 3) { printf("What two numbers would you like to multiply?\n"); scanf("%d", &x); scanf("%d", &y); printf("The product of your two numbers are : %d\n", mult(x,y)); } else if (choice == 4) { printf("What two numbers would you like to divide?\n"); scanf("%d", &x); scanf("%d", &y); printf("The quotient of your two numbers are : %d\n", divide(x,y)); } else if (choice == 5) { printf("What number do you want to find the sqrt of ?"); scanf("%d", &x); printf("The answer is : %f\n", sqroot(x)); } else if (choice == 6) { printf("What number is what you want to find ?\n"); scanf("%d", &x); printf("[1] Cos\n"); printf("[2] Sin\n"); printf("[3] Tan\n"); scanf("%d", &y); if (y == 1) { printf("The answer is : %f\n", cosine(x)); } else if (y == 2) { printf("The answer is : %f\n", sine(x)); } else if (y == 3) { printf("The answer is : %f\n", tangent(x)); } else { printf("Invalid Selection"); } } else if (choice == 7) { printf("What number would you like to find the log of ?\n"); scanf("%d", &x); printf("The answer is : %f\n", loggy(x)); } else if (choice == 8) { printf("Bye!\n"); return 0; } else { printf("Invalid Selection\n"); } }

Thanks for any help!!!

Revekius