Solution for Exercise 6-1

ex0601

#include <stdio.h>

int main()
{
    int x;

    x = 5;
    printf("The value of variable x is %d.\n",x);
    return(0);
}

Notes

* I generally place a blank line — white space — after variable declarations in my code.

* The order is important when you assign a value to a variable. The value, or equation or function, always goes on the right. The variable always goes on the left. It never looks like this:

5 = x;

The above statement doesn't work in the C language.

* The x in printf()'s formatting string is simply the letter x. That's because it appears in the double quotes, and it's not an escape sequence or a placeholder.

* I suppose x is a common variable name thanks to algebra. "What is the value of x?" X is unknown. It's also one of the coolest letters of the alphabet, right up there with Z. If you're a bad guy or an evil alien, your name probably starts with an X or a Z. Of course, z isn't a common variable name, which is odd.

Exercise ex0602 →