diff options
| -rw-r--r-- | include/usage.h | 6 | ||||
| -rw-r--r-- | miscutils/dc.c | 20 |
2 files changed, 24 insertions, 2 deletions
diff --git a/include/usage.h b/include/usage.h index 851023e..268c23c 100644 --- a/include/usage.h +++ b/include/usage.h @@ -280,8 +280,10 @@ "expression ..." #define dc_full_usage \ "This is a Tiny RPN calculator that understands the\n" \ - "following operations: +, -, /, *, and, or, not, eor.\n" \ - "i.e., 'dc 2 2 add' -> 4, and 'dc 8 8 \\* 2 2 + /' -> 16" \ + "following operations: +, add, -, sub, *, mul, /, div, %, mod, "\ + "**, exp, and, or, not, eor.\n" \ + "For example: 'dc 2 2 add' -> 4, and 'dc 8 8 \\* 2 2 + /' -> 16.\n" \ + "\nOptions:\n" \ "p - Prints the value on the top of the stack, without altering the stack.\n" \ "f - Prints the entire contents of the stack without altering anything.\n" \ "o - Pops the value off the top of the stack and uses it to set the output radix.\n" \ diff --git a/miscutils/dc.c b/miscutils/dc.c index 451423c..f574ae4 100644 --- a/miscutils/dc.c +++ b/miscutils/dc.c @@ -44,6 +44,13 @@ static void mul(void) push(pop() * pop()); } +static void power(void) +{ + double topower = pop(); + + push(pow(pop(), topower)); +} + static void divide(void) { double divisor = pop(); @@ -51,6 +58,13 @@ static void divide(void) push(pop() / divisor); } +static void mod(void) +{ + unsigned int d = pop(); + + push((unsigned int) pop() % d); +} + static void and(void) { push((unsigned int) pop() & (unsigned int) pop()); @@ -119,10 +133,16 @@ static const struct op operators[] = { {"mul", mul}, {"/", divide}, {"div", divide}, + {"**", power}, + {"exp", power}, + {"pow", power}, + {"%", mod}, + {"mod", mod}, {"and", and}, {"or", or}, {"not", not}, {"eor", eor}, + {"xor", eor}, {"p", print_no_pop}, {"f", print_stack_no_pop}, {"o", set_output_base}, |