main()之前做点什么

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#include <iostream>
using namespace std;

int main() {
	cout << "m" << endl;
}

void Main() {
    cout << "M" << endl;
}

int a = (Main(), 0);
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➜  before-main ./1 
M
m
➜  before-main
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#include <iostream>
using namespace std;

int main(int argc, char *argv[]) {
	cout << argc << endl;
	for(int i = 0; i < argc; i++) cout << argv[i] << endl;
}

int argc = 3;
char *argv[] = {(char*)"M", (char*)"MM", (char*)"MMM"};

void Main() {
	main(argc, argv);
}

int a = (Main(), 0);
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➜  before-main ./2
3
M
MM
MMM
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./2
➜  before-main