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Floating Point Issues - Programming

Q1:

What will be the output of the program? 
#include<stdio.h>
int main()
{
    float d=2.25;
    printf('%e,', d);
    printf('%f,', d);
    printf('%g,', d);
    printf('%lf', d);
    return 0;
}

A 2.2, 2.50, 2.50, 2.5

B 2.2e, 2.25f, 2.00, 2.25

C 2.250000e+000, 2.250000, 2.25, 2.250000

D Error

ANS:A - 2.2, 2.50, 2.50, 2.5

printf('%e,', d); Here '%e' specifies the 'Scientific Notation' format. So, it prints the 2.25 as 2.250000e+000. printf('%f,', d); Here '%f' specifies the 'Decimal Floating Point' format. So, it prints the 2.25 as 2.250000. printf('%g,', d); Here '%g' 'Use the shorter of %e or %f'. So, it prints the 2.25 as 2.25. printf('%lf,', d); Here '%lf' specifies the 'Long Double' format. So, it prints the 2.25 as 2.250000.