Implementation of unsigned integer addition in Brainfuck. Assumes pointer placement to be at byte zero, and the following eight bytes to represent two four-byte integers.

brainfuck addition

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=====================================================================================================
===================================|		Perform Addition:		|========================================
=====================================================================================================
=====================================================================================================

FOR EACH UNIT IN BYTE 5:
>>>>[-<<<<
			INCREMENT BYTE 1:
			+															B1
			[->>>>>>>>+>+<<<<<<<<<]>>>>>>>>>[-<<<<<<<<<+>>>>>>>>>]		B10
			+<[- >[-]<]>[- <<<<<<<<<[-]>								B2
				+														B2
				[->>>>>>>+>+<<<<<<<<]>>>>>>>>[-<<<<<<<<+>>>>>>>>]	    	B10
				+<[- >[-]<]>[- <<<<<<<<[-]> 							B3
					+													B3
					[->>>>>>+>+<<<<<<<]>>>>>>>[-<<<<<<<+>>>>>>>]		      B10
					+<[- >[-]<]>[- <<<<<<<[-]>+							B4
						[->>>>>+>+<<<<<<]>>>>>>[-<<<<<<+>>>>>>]		        	B10
						+<[- >[-]<]>[- <<<<<<<<<[-]>[-]>[-]>[-]>>>>>>]	    B10
					]						
				]		
			]
			<<<<<<<<<
>>>>]


FOR EACH UNIT IN BYTE 6:
>[-<<<<<
		INCREMENT BYTE 2:
		>+															                      B2
		[->>>>>>>+>+<<<<<<<<]>>>>>>>>[-<<<<<<<<+>>>>>>>>]			B10
		+<[- >[-]<]>[- <<<<<<<<[-]> 							          	B3
			+													                        	B3
			[->>>>>>+>+<<<<<<<]>>>>>>>[-<<<<<<<+>>>>>>>]			  B10
			+<[- >[-]<]>[- <<<<<<<[-]>+								          B4
				[->>>>>+>+<<<<<<]>>>>>>[-<<<<<<+>>>>>>]				    B10
				+<[- >[-]<]>[- <<<<<<<<<[-]>[-]>[-]>[-]>>>>>>]		B10
			]						

		]															                      B10
		<<<<<<<<<
>>>>>]


FOR EACH UNIT IN BYTE 7
>[-<<<<<<
		>>+														                    	B3
		[->>>>>>+>+<<<<<<<]>>>>>>>[-<<<<<<<+>>>>>>>]				B10
		+<[- >[-]<]>[- <<<<<<<[-]>+									        B4
			[->>>>>+>+<<<<<<]>>>>>>[-<<<<<<+>>>>>>]			  		B10
			+<[- >[-]<]>[- <<<<<<<<<[-]>[-]>[-]>[-]>>>>>>]		B10

		]															                      B10
		<<<<<<<<<		
>>>>>>]


FOR EACH UNIT IN BYTE 8
>[-<<<<<<<
		>>>+														                  B4
		[->>>>>+>+<<<<<<]>>>>>>[-<<<<<<+>>>>>>]						B10
		+<[- >[-]<]>[- <<<<<<<<<[-]>[-]>[-]>[-]>>>>>>]		B10
		<<<<<<<<<	
>>>>>>>]

RETURN POINTER TO ORIGIN
<<<<<<<