Writing FreeDOS programs in C (flow control)

Welcome to part 3 of my weekly video series, where I teach you how to write FreeDOS (or Linux) programs in C. In this video, we'll learn about flow control in C.
if-else, switch, and loops

This is part of the "Writing FreeDOS programs in C" series

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[emem]

Huge thanks for C tutorials! Hope to see more advanced things to learn.

[mattlivingston]

Here is a short program which illustrates the difference between "while" and "do while"



=== 2whiles.c ===
#include <stdio.h>

int main () {
int i = 5;
while (i < 5) {
printf("(inside the while loop)\nThe value of i is %d\n\n ", i);
i = i +1;
}
printf("(After the while loop)\nThe value of i is %d... That's unchanged\n\n", i);

i = 5;
do {
printf("(Inside the do while loop)\nThe value of i is %d\n\n", i);
i = i +1;
} while (i < 5);
printf("(After the do while loop)\nThe value of i is %d... Why?\n\n", i);
}


=== end-of-file ===


A "do while" loop will always execute at least once, then check to see whether it should execute again.