How to square a number with C++

[shop]

what is the simplest or the plain code for squaring a number?

i.e

in a loop form

for(i=1; i<20; i++) //shows squaring output of 1 up to 20
int x; //
int y; //
1
..
20 // in a loop form, how do i square??

variables..
codes....
printf("??????" );

[donbock]

Are you familiar with using arithmetic operators (add, subtract, multiply, divide) in an expression?
Forget about programming for a moment, how would you manually square a number using a simple 4-function calculator?

[shop]

i would square it by its self..

[shop]

yes i understand but i want to know the coding.

in times table it would be:

int main()
{
	//Times table
	printf("\n");
	
	int i, j, k, l;
	int result; 
	int result2;
	
	printf("Times table to follow\n");
	printf("\n");

	for(i=0; i<12; i++)  //will go through it 12 times starting at 0
	{
		result = i*1;
		result2 = i*2;
		
		printf("%d times 1 = %d	", i, result);
		printf("%d times 2 = %d\n", i, result2);
	}
	
/* Doing the same with a while loop*/
	i=0;

	while(i<=12)     // print times tables for 3 and 4
	{
		result = i*3;
		result2 = i*4;

		printf("%d times 3 = %d		", i, result);
		printf("%d times 4 = %d\n",i, result2);
		i++;
	}

return 0;

}

[shop]

So how do i do it for squaring?? atleast a clear hint.. please

[Banfa]

When posting code please use [code]...[/code] tags round it to format it.


I think the problem is simpler than you imagine in your last code listing you only need to change a single character on the result calculation lines to go from times table to square output.

From post #3 I guess you know how to square a number all you have to do is write that formula into your code.

[donbock]

In mathematical notation, exponentiation is typically represented by a superscript (for squaring, the superscript is "2"). C and C++ do not have an exponentiation operator so you need to find another way to describe the exponentiation function.

Forget about programming for a moment, suppose you have a simple 4-function calculator. It has buttons for addition, subtraction, multiplication, and division; but no buttons for exponentiation or squaring. How would you compute "9 squared" on this calculator?

C/C++ expressions support those same four functions; so use the same computation method in your expression statement that you used on the calculator.

[jkmyoung]

a squared = a X a.
Put that into code.