C++

Function definition is a function body that noted what function will do.
Syntax 1:

Return_type Function_name (para 1, para 2,… , para n)
{
	statement 1;
        statement 2;
        ...
	statement n;
        return value;
}

Syntax 2:

Non Return type function_name(para 1, para 2,… , para n)
{
	statement 1;
        statement 2;
        ...
        statement n;
}

Example 1:

float sum(float v1, float v2, float v3)
{
	float s;
	s=v1+v2+v3;
	return s;
}

Example 2:

void sum1(float v1, float v2, float v3)
{
	float s1;
	s1=v1+v2+v3;
	cout<<“Sum of three values: “<<s1;
}

Example 3:

int maximum(int v1,v2,v3)
{
	int max;
	if(v1>v2&&v1>v3)
		max=v1;
	else if(v2>v1&&v2>v3)
		max=v2;
	else
		max=v3;
	return max;
}

Example 4:

void maximum(int v1,v2,v3)
{
	if(v1>v2&&v1>v3)
		cout<<"Maximum is: "<<v1; 
        else if(v2>v1&&v2>v3)
		cout<<"Maximum is: "<<v2; 
	else
		cout<<"Maximum is: "<<v3;
}