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Link: http://codepad.org/1yxoCSi7    [ raw code | output | fork ]

C, pasted on Apr 29: 
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#include<stdio.h>
main()
		{
			extern int i;
		{ 	int i=20;
		 { 	
		   const volatile unsigned i=30; printf("%d",i); 
		 }
	  	printf("%d",i);
		}
		  printf("%d",i);
	}


Output: 
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In function `main':
undefined reference to `i'


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