The role of int main(int argc, char* argv[])

main(int argc, char* argv[]): argc indicates the number of all parameters in spaces when the file is running. The argv[] array holds all strings at once.

for example:

test one two three<回车>

argc = 3,从0-3，argv[0] = test,argv[1]=one,argv[2]=three;

This thing was handed down in the DOS era. The program is followed by parameters. Generally, the program needs parameters or needs to operate the target.