#include<stdio.h>

int main(){
	int a = 5;
	int b = 10;
	if(a < b){ // Braces are optional for one-line 
		printf("Logic works today!\n");
		// If we had something to say here, it would make the braces mandatory
	} else if (b < a) 
	{ // Some people like this better (visual studio does this)
		printf("Logic is broke\n");
	} else printf("That was weird"); // Some people will be upset
		// Here is generally prefered, but not universal
	
	/*
	 * = gives a return value of the value assigned
	 * Integers are ok for truth values!
	 * 0 is false, anything else (even negatives) is true
	 * Be careful!  = doesn't generate an error, but == might be what you mean!
	 */
	if (a = 5) { // This is TRUE and changes a to 5
		printf("a = %d\n", a);
	}

	char c; // Go ahead and use c like it's a boolean
	// Typical loop
	int i = 0;
	while(i < 10){
		printf("i = %d\n", i);
		i++;
	}
	
	// int i = 0; // This is a "redefinition of i"
	i = 0;
	while(i < 10)
		printf("i = %d\n", i++); // i++:  Take the value, THEN increase the value of i
										// ++i:  Increase the value, THEN take the value
	// i is still around!  Let's do better, and contain j
	// Starting a block like this, contains inside variables
	{
		int j = 0; // j is local to the block we just started!
		while(j < 10){
			printf("j = %d\n", j);
			j++;
		}
	}  // j is out of scope after this

	int j = 0; // We want this to work
	// For loops!  C89 style (assuming you don't want k afterward)
	{
		int k;
		for(k = 0; k < 10; k++)
			printf("k = %d\n", k);
	}
	// C99 and later
	for(int k = 0; k < 10; k++)
		printf("k = %d\n", k);

	int add_aandb(){
		return a+b;
	}
	printf("a + b = %d\n", add_aandb());
	double g = a + b;
	printf("g = %lf\n", g);
	// This is a variable that holds the memory address of a function that
	// takes no parameters and returns an int
	int (*foo)() = add_aandb; // foo is the name I made up
	printf("a + b = %d\n", foo());

	printf("8 / 3 = %d\n", 8/3);
	printf("8 / 3 = %lf\n", 8./3);
	int x,y; // Yes, you can make two on the same line
	x = (y = 10) + 5;
	printf("x = %d, y = %d\n", x, y);

	// No effect on a and b from outside this function
	double add_numbers(double a, int b){
		return a + b;
	}

	// void:  This doesn't return anything
	void print_message(char* message){
		printf("The message was:  %s\n", message);
	}
	print_message("There is a chicken in my kitchen\n");

	
	return 0;
}