Do we need a test condition to run a for loop?

[Supratit]

my question is can we run a for loop in c without a test condition?
like this:
for( ; ; )
will this run the code in the for block or will this turn out to be false?

 

[VBService]

Yes you can use for ( ;; ) loop as infinite loop, e.g.
[ on-line ]

#include <stdio.h>
#include <stdlib.h>
#include <ncurses.h>
#include <unistd.h> // For sleep function

int main() {
    initscr(); // Initialize ncurses

    printf("Press 'q' to exit...\n");
    sleep(2);
    clear();
    refresh();
   
    cbreak(); // Enable 'cbreak' mode, which doesn't wait for Enter key
    noecho(); // Disable echoing of typed characters
    nodelay(stdscr, TRUE); // Set getch() to be non-blocking

    for (;;) {
        int ch = getch(); // Read a single character without blocking

        if (ch == 'q') {
            printf("Exiting...\n");
            sleep(2);
            break;
        }

        printf("Message every 1 second...\n");
        refresh(); // Refresh the ncurses screen
        sleep(1); // Wait for 1 second
    }

    endwin(); // End ncurses

    return 0;
}

 

[codingZ]

my question is can we run a for loop in c without a test condition?
like this:
for( ; ; )
will this run the code in the for block or will this turn out to be false?

Yes, you can run a for loop in C without a test condition, like this:

for( ; ; ) {
// Code to be executed indefinitely
}

In this case, the for loop will run indefinitely because there is no test condition provided within the parentheses. It will keep executing the code block within the loop repeatedly until it encounters a break statement or some other exit condition within the loop body. This is often referred to as an infinite loop. To exit such a loop, you would typically use a break statement or another control flow mechanism, as there is no built-in test condition to exit it automatically.