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Floating Point Issues - Programming

Q1:

What will be the output of the program? 
#include<stdio.h>
int main()
{
    float a=0.7;
    if(a < 0.7)
        printf('C\n');
    else
        printf('C++\n');
    return 0;
}

A C

B C++

C Compiler error

D Non of above

ANS:A - C

if(a < 0.7) here a is a float variable and 0.7 is a double constant. The float variable a is less than double constant 0.7. Hence the if condition is satisfied and it prints 'C'
Example: 

#include<stdio.h>
int main()
{
    float a=0.7;
    printf('%.10f %.10f\n',0.7, a);
    return 0;
}
Output:
0.7000000000 0.6999999881