15.mdx

fork	group
Frontier	Comparison & Bitwise Logic Operations

Index 1 is top of the stack. See PUSH.

Stack input

0. a: integer.

Stack output

0. a == 0: 1 if a is 0, 0 otherwise.

Examples

*	Input	Output	*	*	Input	Output
1	10	0	*	1	0	1

Reproduce in playground.

Error cases

The state changes done by the current context are reverted in those cases:

• Not enough gas.
• Not enough values on the stack.