# Stepping into assembler functions

Disassembly mode lets you can examine your program as it steps into functions that you do not have source code for [such as printf()]. When the instruction pointer enters a function for which it does not have the source, the function is displayed in the Assembly editor.

When disassembly mode is disabled, the debugger steps over functions for which you do not have the source.

To step into assembler functions during debugging:

- In the Debug view, right-click, and select Disassembly Mode.

As you step Into assembler functions, the execution trace is displayed in the Assembly Editor.

C/C++ Development perspective

Debugging

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