Why is this do while loop not working in c?-CodePudding

Sorry for what may be a commonly asked question but my code is a lot simpler to any other questions I've seen and it still isn't working.

My code:

#include <cs50.h>
#include <stdio.h>

int main(void)
{
  int n;
  do
  {
    n = get_int("Width: ");
  } 
  while (n < 1);
}

This code is an exact copy from Harvard's cs50 course. What I expect is if n is less than 1, it will prompt the user again until a value of 1 or above is entered. However, it is only asking me for width once even when I enter 0 and finishing.

CodePudding user response：

This is the way to handle this kind of issues:

Either you start using a debugger and put a breakpoint at the following line:

int main(void)
{
  int n;
  do
  {
    n = get_int("Width: ");
  } // here you set your breakpoint
  while (n < 1);
}

You add a watch for the variable n and check the value.

Another approach is the following:

int main(void)
{
  int n;
  do
  {
    n = get_int("Width: ");
    printf("The value of n is [%d]", n); // this line shows the value of n
  } 
  while (n < 1);
}

Bottom line: you need to investigate the value of n, either using a debugger, either showing it on screen.

CodePudding user response：

You are including the cs50 library at the top but have you imported it on your PC if not make sure to include #include <cs50.h> atop your file and compile with the -lcs50 flag. CS50 Library for C