Consider the following C program :

#include <stdio.h>

int main(){

    float sum = 0.0, j = 1.0, i = 2.0;

    while (i/j > 0.0625){

        j = j + j;

        sum = sum + i/j;

        printf("%f\n", sum);

    }

    return 0;

}

The number of times the variable sum will be printed, when the above program is executed, is _________.

Which one of the following languages over $\Sigma=\{a, b\}$ is NOT context-free?