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Difference between int and double???

1 New Member
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  1. #include<iostream>
  2. using namespace std;
  3. int main()
  4. {
  5.     double x,i;
  6.     cout<<"Enter the value of the number\n";
  7.     cin>>x;
  8.      for(i=0;i<x;i=i+0.1)
  9.     {                     cout<<"value of i"<<i<<endl;
  10.                           double l=i*i;
  11.                           cout<<"value of square "<<l<<endl;
  12.                           if(x==l)
  13.                           break;
  15.     }
  16.     cout<<"the sqrt is "<<i;
  18.     system("PAUSE");
  19.     return 0;
  20. }
why I am not getting exact square root if I take x as double,but if I am taking it as int I got the correct result.
Jul 31 '13
15 46857
62 New Member
Decimal can 100% perfectly represent any number within the precision of the decimal format. In contrast, Float and Double, cannot perfectly represent all numbers, even numbers within their respective formats precision. Int data type is utilized to allocate integer values. It stores 2 bit
Jul 23 '20 #11
2 New Member
It usually occupies 32 bits in the computer memory with 4 bytes. An integer can have a maximum value of 2,147,483,647, whereas a float can have a maximum value of 3.4028235 ◊ 1038.

Double is an IEEE 754 64 bits double-precision floating-point format data type, which is also used to represent floating-point numbers. IEEE 754 is a standard representation of floating-point numbers in a computer.

Blog link to know about the difference between float and double.
Nov 22 '21 #12
2,426 Recognized Expert Top Contributor
As weaknessforcats said 7y ago, the C Standard allows compiler implementations substantial flexibility regarding the internal representation for the various types.

Standard library header <limits.h> provides a method for the compiler implementation to tell an application program some details of the implementation-defined internal representation of integral types.
  • INT_MIN and INT_MAX are the minimum negative / maximum positive values that can be represented by type int.

Standard library header <float.h> provides a method for the compiler implementation to tell an application program some details of the implementation-defined internal representation of floating-point types.
FLT_MIN and FLT_MAX are the minimum/maximum positive values that can be represented by type float.
DBL_MIN and DBL_MAX are the minimum/maximum positive values that can be represented by type double.
LDBL_MIN and LDBL_MAX are the minimum/maximum positive values that can be represented by type long double.

sizeof(typename) tells you how many bytes it takes to represent a number of type typename.
Nov 22 '21 #13
3 New Member
They share certain commonalities, despite their differences at first look. Integral representations exist for floating-point datatypes. Double is simply a double floating-point datatype, while float is a single(?) floating-point datatype. However, just because they have a decimal does not mean they are accurate data types. Use them for approximation rather than precision.
Nov 28 '21 #14
Riya Bajpai
18 New Member
int refers to integer in which we can use whole numbers only where as double is for decimal numbers. For example 1 is an integer and 1.0 is a decimal.
Mar 15 '23 #15
22 New Member
"int" and "double" are data types used in programming languages like C++, Java, and Python, but they represent different values.

"int" is acronym for integer and is used to represent whole numbers (positive, negative, or zero) that do not have a fractional part. In most programming languages, the range of values that can be represented by an "int" is determined by the number of bits used to store it. For example, a 32-bit "int" can represent values from -2,147,483,648 to 2,147,483,647.

On the other hand, "double" is short for double-precision floating-point, and it is used to represent decimal numbers (positive, negative, or zero) that have a fractional part. In most programming languages, a "double" is represented using 64 bits, which allows it to describe a broader range of values than an "int." However, the precision of a "double" is limited by the number of bits used to represent it, so it may not be able to represent very small or huge values with complete accuracy.
Mar 23 '23 #16

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