CODEWITHSUNDEEP
cfloating-point
user1583848
user1583848

Reputation: 41

Regarding floats and comparison operator in C

int main()
{
    float lfResult = 19.893196;
    if(lfResult == 19.893196)
        printf("Works");
    else
        printf("does not work");

    getch();
    return 0;
}

Output: does not work

Why does the if condition fail?

Upvotes: 4

Views: 138

Answers (3)

Prasad G
Prasad G

Reputation: 6718

In if condition, 19.893196 can be taken as double. So the if condition fails.

You should try like following way.

if(lfResult == 19.893196f)

I think it will be helpful to you.

Upvotes: 0

CapelliC
CapelliC

Reputation: 60034

your literal is a double, casted to float in assignement.

try:

if(lfResult == 19.893196F)
  ...

Upvotes: 1

cnicutar
cnicutar

Reputation: 182794

In C floating constants have the type double. Try:

float lfResult = 19.893196f;
if(lfResult == 19.893196f)
                        ^

Thus the constant 19.893196 has more precision than lfResult.

6.4.4.2 - 4

An unsuffixed floating constant has type double. If suffixed by the letter f or F, it has type float. If suffixed by the letter l or L, it has type long double.

Upvotes: 8

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