c++ - 求解C语言main函数

Question

int main P2(int, argc, char **, argv)这个是什么意思？入口函数吗

Answer 1

After searching, I found a similar question on stackoverflow: why main P2((ac, av), int ac, char ** av)?

It probably means that P2 is a macro. This macro is for compatibility with older versions of compilers. For example, some early C languages ​​are not

int main(int argc, char *argv[])

but

main(ac,av)
int ac;
char **av;

P2(int, argc, char **, argv)This macro will use different int main() forms depending on the compiler.

Answer 2

There is no such syntax in C. If it can be compiled like this, P2 should be a macro

#define P2
int main P2(int argc, char** argv) {
    return 0;
}