C++0x printf() printing wrong value for double [duplicate]

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• What is the difference between %f and %lf in C? 3 answers

Today i was trying to print a double value with printf using %lf but got 0.000000 . but when I tried to print the same thing with %f I got correct result. Why this happened? I use c++0x(c++11 I think.)

#include<stdio.h>

int main()
{
    double aaa;
    aaa=1.23;
    printf("%lf\n",aaa);
    printf("%f\n",aaa);
    return 0;
}