An example C program demonstrating different data types, their variables and their naming conventions.

datatypes-example.c

/*An example C program to demonstrate different data types.*/
#include <stdio.h>

int main()
{
  int meaningOfLife = 42;
  float a_random_float = 56.9;  
  double pi = 3.141;
  char c = 'c';
  
  printf("\nThe integer meaningOfLife holds the value: %d and it's size is: %d", meaningOfLife, sizeof(meaningOfLife));
  printf("\nThe float a_random_float holds the value: %f and it's size is: %d", a_random_float, sizeof(a_random_float));
  printf("\nThe double pi holds the value: %lf and it's size is: %d", pi, sizeof(pi));
  printf("\nThe character c holds the value: %c and it's size is: %d", c, sizeof(c));
  
return 0;
}