#include <stdio.h>

int add(int a, int b){
    return a+b;
}

int func1(int a){ //a = 10
    return 10 + a * 2;
}

void minus(int a, int b){
    printf("%d\n", a - b);
}

void func2(){
    printf("안녕 %d", 10);
}

int main() {
    printf("%d\n", add(10, 20));
    printf("%d\n", func1(10));
    minus(10, 5);
    func2();
    func(5);
}

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