Math Functions

There are many math functions available to us via C header files:

• sin(angle) for finding the sine of an angle in radians
• cos(angle) for finding the cosine of an angle in radians
• tan(angle) for finding the tangent of an angle in radians
• abs(number) to get the absolute value (modulus) of a number
• floor(number) for rounding a number downwards
• ceil(number) for rounding a number upwards
• pow(base,exponent) for raising a base to the power of exponent

Most of these are available via math.h header file whereas abs() is in the stdlib.h header file.

#include <math.h>
#include <stdio.h>
#include <stdlib.h>

int main() {
  double x = 1.57;
  int y = -3;

  printf("The sine of %g is %g\n", x, sin(x));
  printf("The cosine of %g is %g\n", x, cos(x));
  printf("The tangent of %g is %g\n", x, tan(x));
  printf("The absolute value of %d is %d\n", y, abs(y));
  printf("The floor/gaussian of %g is %g\n", x, floor(x));
  printf("The ceil of %g is %g\n", x, ceil(x));
  printf("%g raised to the power of %d is %g\n", x, y, pow(x, y));
}