A for statement consists of three parts. The first part is the initialization section. In that example, the initialization section is "int x = 0". This declares x to be an int(eger) and assigns it an initial value of 0.
The second part is the continue condition. In the example, the continue condition is "x < 100". This means that the body of the for statement (the part between the { and } that follow) will be executed over and over, as long as x is less than 100.
The third part is the increment section. This code is executed after each execution of the body of the statement, before the continue condition is checked. In the example, the increment section is "x++". This means that x will be incremented by 1 after each execution of the body of the loop.