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Shows how to write a method like pow() without the use of <math.h>
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Submitted By: gabehabe
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Rating:
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Views: 453 |
Language: C
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Last Modified: October 5, 2008 |
Snippet
/* * A simple exponent function~ similar to pow() * Author: Danny Battison * Contact: gabehabe@googlemail.com */ double exponent(double x, double y) { int i; // use for the loops! if (y == 0) return 1; // power of 0 always returns 1 double total = x; // the return value if (y > 0) // we should multiply for (i = 1; i < y; i++) total *= x; // increase total else // y < 0 (we should divide) for (i = 0; i <= y*-1; i++) total /= x; return total; } /** EXAMPLE USAGE **/ #include <stdio.h> int main() { printf("%.2f\n",exponent (- 2,- 2)); // result will be 0.25 printf("%.2f",exponent (2, 2)); // result will be 4.00 return 0; // successful execution }
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