This is a very simple Hello World program in C. int main() { write(1, "Hello World\n", 14); }int main() { write(1, "Hello World\n", 14); } Counting how long a text string is. #include <stdio.h> #include <string.h> #define MSG "Hello Doctor, let’s get back to the TARDIS!" int main() { int g; g = strlen(MSG); if …