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- #include <stdio.h>
- int x2 (int n ) { return n*2; }
- int x4 (int n ) { return n*4; }
- int (*op[])(int) = {
- x2,
- x4
- };
- #define A(n) a##n
- int main () {
- int a1 = 1;
- int a2 = 2;
- int a3 = 3;
- printf("%d\n", A(3));
- printf("%d\n", A(2));
- printf("%d\n", A(1));
- }
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