C/C++ How to Get main Method Parameter

int main(int argn, char * argv[]) {
    if (argn == 1) {
        printf("Parameter at index 0 is %s\n", argv[0]);
        exit(0);//Exit without error

    char strOne[1024];
    if (argn == 2) {
        strcpy(strOne, argv[1]);
        printf("Parameter at index 1 is %s\n", strOne);
        exit(1);//Exit with error

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