Cpp - Initialize more than one variable, test a compound logical expression, and execute more than one statement in for loop.

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Introduction

When the initialization and action sections contain more than one statement, they are separated by commas. Here's an example: 

for (int x = 0, y = 0; x < 10; x++, y++) 
{ 
    std::cout << x * y << "\n"; 
}

This loop has an initialization section that sets up two integer variables: x and y.

The loop's test section tests whether x < 10.

The loop's action section increments both integer variables, using a comma between the statements.

The body of the loop displays the product of multiplying the variables together.

Each section of a for loop can be empty.

The semicolons are still there to separate sections, but some of them contain no code. Here's an example: 

int x = 0; 
int y = 0; 
for ( ; x < 10; x++, y++) 
{ 
    std::cout << x * y << "\n"; 
}

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