The C language provides two data types to deal with real numbers (numbers with decimal points e.g. 1.35, 253.235). The real numbers are also known as floating point numbers

**Float**

**Double**

**Float Data Type**

To store numbers, float data type is used. The float data type uses four bytes to store a real number

**Double Data Type**

If we need to store a large real number which cannot be store in four bytes, then we use Double data type. Normally the size of double is twice the size of float. In Double x = 3264664.548797

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