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#define printnum1(x) \        printf("%d \n", x); \        printf("%d \n", x)void printnum2(int x) {        printf("%d \n", x);        printf("%d \n", x);}int main() {        int i = 5;        printf("printnum2: \n");        printnum2(i++);        printf("printnum1: \n");        printnum1(i++);        return 0;}