Well , im certainly no Master Programmer , but like HTRegz said , You need a compiler to tell the computer what exactly we are trying to accomplish. But with programming languages like C , there are certain functions like the if statement and the else statement. It is basically saying if this is true , then do this function. For example , this is a C program that displays output to the screen.
#include <stdio.h>
int main(){
printf("Hello");
}

Im not here to explain how that code works , but I know just the site to get you started
www.bloodshed.net Download Dev C++ it's a c , c++ compiler used to make your code executable
http://www.ankitfadia.com/cfirst.htm
Have fun and keep reading..