#include <iostream>
#include <cmath>
using namespace std;

int main()
{
    int k;
    float a,b,c,x1,x2,tmp;
    a = -90.555;
    b = 10.5;
    c = -100.;

   if(a<b) a=0;else a=c;
    std::cout <<"a, b, c="<< a << ", "<< b << ", "<< c <<  std::endl;
    a = (a>b)? b:a;
    std::cout <<"a, b, c="<< a << ", "<< b << ", "<< c <<  std::endl;
    a = (a<b)? b:a;
    std::cout <<"a, b, c="<< a << ", "<< b << ", "<< c <<  std::endl;


 return(0);
}



$ ./a
a, b, c=0, 10.5, -100
a, b, c=0, 10.5, -100
a, b, c=10.5, 10.5, -100