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/* goldstein-price.c:
The Golstein-Price Optimization test function
Written 2018 by Edwin A. Suominen as an example for the "ade" python
package. This C code file is dedicated to the public domain.
Compile with
"gcc -Wall -o goldstein-price goldstein-price.c"
If you don't have gcc, install it first with
"sudo apt install gcc"
Provide X and Y float values via STDIN, separated by a space and
ending with a newline. Prints result float value on STDOUT ending
with a newline.
Enter "99999 99999" as X and Y and the overflowing result will
terminate the program. Or just send Ctrl+C.
*/
#include <stdio.h>
#include <math.h>
float gp(float x, float y) {
float z, result;
z = x + y + 1;
z *= z;
z *= 19 - 14*x + 3*x*x - 14*y + 6*x*y + 3*y*y;
z += 1;
result = z;
z = 2*x - 3*y;
z *= z;
z *= 18 - 32*x + 12*x*x + 48*y - 36*x*y + 27*y*y;
z += 30;
result *= z;
return result;
}
int main() {
float x, y, result;
while (1) {
scanf("%f %f", &x, &y);
result = gp(x, y);
if (isinf(result))
break;
printf("%f\n", result);
}
return 0;
}