Here, the C program prints “Hello World!” in the output window. And, all syntax and commands in C programming are case sensitive. Also, each statement should be ended with semicolon (;) which is a statement terminator. Here, stdio.h is header file that contains all standard libraries for input and output. #include<stdio.h> #include<conio.h> void main() { clrscr(); printf("Hello World!"); getch(); } OutPut : Hello World!