如何编写正确的 do..while 循环？

Question

for some reason this code throws an error when I'm trying to compile it. What is wrong, can you tell me please? I'm taking a CS50 course and it's actually the first assignment.

The program has to prompt the user for input until the condition is false.

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

int n;

do
{
    n = get_int();
}
while ( n < 0 || n > 23 );

This is the Error:

pyramid.c:6:1: error: expected identifier or '('
do
^
pyramid.c:10:1: error: expected identifier or '('
while ( n < 0 || n > 23 );

Answer 1

This is the generic example of using do {...} while(); loop in C. cs50 is not the standard C header, this is homecooked for the students who take cs50 course.

You should check the get_int() ; definition in the cs50.h header file.

Code:

#include <stdio.h>
int main()
{
    int number;

    // Do while loop is executed at least once
    do
    {
      printf("Enter a number from 0-23: ");
      scanf("%d", &number);

    }
    while(number < 0 || number > 23);

    printf("Number = %d\n",number);

    return 0;
}