Question

I need a condition for a do-while loop that means the loop is repeated (asking user to enter data again) until it is an integer number and between 1 and 25.

while (!isdigit(data) || data < 1 || data > 25);

This just throws out a runtime error and I’m not sure why.

Answer 1

Try this:

do {

   /* Read from input and store it in data */

} while( !isdigit(data) || !( data > 1 && data < 25 ) );