input value from terminal to c

1int main(int argc, char* argv[]){/*...*/}

1#include <stdio.h>
2#include <stdlib.h>
3
4int main(int argc, char *argv[])
5{
6   int rings;
7   if(argc != 2) {
8       printf("Usage: %s number-of-rings\n",argv[0]);
9       return 1;
10   }
11
12   rings = atoi(argv[1]);
13   printf("Using number-of-rings = %d\n", rings);
14...
15
16   return 0;
17}
18