Question

My doubt is to skip a “.” from the input stream and read the whole number and the fractional parts in two different variables. Say I have an input like 10.26, I want store 10 in one variable a and 26 in another variable b.

In C, using scanf , I will do it like

scanf("%d.%d",&a,&b);

What is the equivalent way to do in C++ using cin? or should I include cstdio and use the scanf itself?

Answer 1

You can read the float as normal and use C-library’s modf function to split the number:

#include <cmath>

float f = 0.0;
float ipart = 0.0;
float fpart = 0.0;

if (cin >> f)
    fpart = modf(f, &ipart);
else {
    // input failed
}

Let operator>> do the error checking!