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// A demonstration program #include <stdio.h> #if 0 /* */ #define DUMMY() \ if (1); #endif #define M\ \ int main() { double x[] = {3.14159,6.02e23,1.6e-19,1.0+1}; int y[] = {75,0113,0x4b}; printf("hello world %d %g\n", y[0], x[0]); }