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.