1. 

            #include<stdio.h>

            int main()

            {

                   printf("In C, lowercase letters are significant.\n");

                   printf("Main is where program execution begins.\n");

                   printf("Opening and closing braces enclose program statements in a routine.\n");

                   printf("All program statements must be terminated by a semicolon.\n");

                   return 0;

            }


    2.    

       Testing.......1...2..3