Control Flow

In this section, I'll be going over the most common control flow operator: if/else . This operator basically executes one section of code, or another, depending on a condition. Let's look some examples below:

/// Ex 1.

int b = 5;
int a = 6;

if (a == 6) {
    b = 4;
}

// b == 4



/// Ex 2.

int c = 8;
int d = 2;

if (d == 3) {
    c = 9;
} else {
    c = 0;
}

// c == 0



/// Ex 3.

int e = 4;
int f = 3;
int g = 1;

if (f == 9) {
    g = 10;
} else if (f == 3) {
    g = 11;
} else {
    g = 12;   
}

// g == 11

The way an if-statement works, is that inside the parentheses, you place an expression that evaluates to a boolean value. It's relatively simple to understand, as you basically check if the expression evaluates to true, and if it does, you execute the code inside that if-block, otherwise you either move on to the else-if or else block (if there is one), or move on with the rest of the code.

Exercises

// 1. 

int a = 5;
int b = 6;
int c = 6;

if (a * b == 30) {
    c = 7;
} 

// what is 'c': ___ ?



// 2.

int a = 2;
int b = 3;
int c = 7;

if (a + b == 5) {
    c = 1;
    if (a * b == 8) {
        c = 2;
    } else {
        c = 3;
    }
} else {
    c = 4;
    if (a * b == 6) {
        c = 5;
    } else {
        c = 6;
    }
}

// what is 'c': ___ ?



// 3. 

int a = 12;
int b = 7;
int c = 1;

if (a <= 10) {
    c = 10;
} else if (a <= 15) {
    c = 11;
} else {
    c = 12;
}

// what is 'c': ___ ?