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/* File : example.c */ /* A global variable */ double Foo = 3.0; int add1(int x, int y) { return x+y; } void add2(int x, int *y, int *z) { *z = x+*y; } int add3(int x, int y, int *z) { *z = x-y; return x+y; } void add4(int x, int *y) { *y += x; }