What's the difference between float and double?

Question

When I run the following code ,

NSString* s= @\"10000000.01\";
float f = [s floatValue];
double d = [s doubleValue];

if(f > 10000000)
{
    NSLog(@\"Ove         


        

Answer 1

float is 32-bit while double is 64-bit. A float has fewer significant digits than double.

A float value doesn't store enough to hold the 10 digits of your 10000000.01.

Also see Difference between float and double for more details. That is about C/C++ but it applies to Objective-C as well.