add some more math operations.

c/mul/main.c

@@ -1,3 +1,4 @@
#include <math.h>
#include <stdio.h>
#include <editline/readline.h>
@@ -9,6 +10,10 @@ long eval_op(long x, char* op, long y) {
	if (strcmp(op, "-") == 0) { return x - y; }
	if (strcmp(op, "*") == 0) { return x * y; }
	if (strcmp(op, "/") == 0) { return x / y; }
	if (strcmp(op, "%") == 0) { return x % y; }
	if (strcmp(op, "^") == 0) { return pow(x, y); }
	if (strcmp(op, "min") == 0) { return x < y ? x : y; }
	if (strcmp(op, "max") == 0) { return x > y ? x : y; }
	return 0;
}
@@ -38,7 +43,7 @@ int main(int argc, char** argv) {
	mpca_lang(MPC_LANG_DEFAULT,
		"\
number   : /-?[0-9]+(\\.[0-9]+)?/ ; \
operator : '+' | '-' | '*' | '/' | /[a-zA-Z-]+/ ; \
operator : '+' | '-' | '*' | '/' | '%' | '^' | /[a-zA-Z-]+/ ; \
expr     : <number> | '(' <operator> <expr>+ ')' ; \
lang     : /^/ <expr>+ /$/ ; \
",