// sinCurve.cpp
// Outputs a sine curve
// -----------------------------------------------------
#include <iostream>
#include <cmath> // Prototypes of sin()
using namespace std;
#define CLS (cout << "\033[2J")
#define LOCATE(z,s) (cout <<"\033["<<(z)<<';'<<(s)<<'H')
#define PI 3.1415926536
#define START 0.0 // Lower limit
#define END (2.0 * PI) // Upper limitSOLUTIONS ■ 151
#define PNT 64 // Number of points on the curve
#define STEP ((END-START)/PNT)
#define xA 14 // Row of x-axis
#define yA 10 // Column of y-axis
int main()
{
int row, column;
CLS;
LOCATE(2,25);
cout << "------- The Sine Function -------";
// --- Draws the coordinate system: ---
LOCATE(xA,1); // x-axis
for( column = 1 ; column < 78 ; ++column)
{
cout << ((column - yA) % 8 ? '\304' : '\305');
}
cout << '\020'; // top
LOCATE(xA-1, yA+64); cout << "2PI x";
for( row = 5 ; row < 24 ; ++row) // y-axis
{
LOCATE(row, yA); cout << '\305';
}
LOCATE( 4, yA); cout << "\036 sin(x)"; // top
LOCATE( xA-8, yA+1); cout << " 1";
LOCATE( xA+8, yA+1); cout << " -1";
// --- Displays the sine function: ---
int begpt = yA,
endpt = begpt + PNT;
for( column = begpt ; column <= endpt ; ++column)
{
double x = (column-yA) * STEP;
row = (int)(xA - 8 * sin(x) + 0.5);
LOCATE( row, column); cout << '*';
}
LOCATE(25,1); // Cursor to the last row
return 0;
}