1.1 Basics-io.c

#include <stdio.h>

int main()
{
  printf("Hello World\n");
  
  int x =50;
  int y; //declaration
  y = 10; //initialization
  
  printf("%s World\n", "Hello");
  
  printf("The value of x is %d\n", x);
  
  printf("X; %d, Y: %d\n", x, y);
  
  printf("Give me a radius: ");
  int radius;
  scanf("%d", &radius); //address-of-operator (pointer)
  
  printf("You chose the value %d\n", radius);
  
  char name[20]; //char array of 20 characters. '\0' takes one spot
  scanf("%19s", name);
  
  printf("Your name: %s\n", name);
  return 0;
}