Summarize odd numbers

gistfile1.cpp

#include <cstdio>
#include <cstdlib>
#include <string.h>

int summarize_odd_numbers(int a, int b)
{
    int sum = 0;
    for (int c = a; c <= b; c++)
    {
        if ((c & 0x1) == 1)
            sum += c;
    }

    return sum;
}

int main() {
    printf("sum = %d from %d to %d\n", summarize_odd_numbers(11, 20), 11, 20);
}