C Program to Find the Size of int, float, double and char

Posted by admin at July 9, 2021

Data types in c refer to an extensive system used for declaring variables or functions of different types. The type of a variable determines how much space it occupies in storage and how the bit pattern stored is interpreted.

The types in C can be classified as follows −

Sr.No.Types & Description
1Basic TypesThey are arithmetic types and are further classified into: (a) integer types and (b) floating-point types.
2Enumerated typesThey are again arithmetic types and they are used to define variables that can only assign certain discrete integer values throughout the program.
3The type voidThe type specifier void indicates that no value is available.
4Derived typesThey include (a) Pointer types, (b) Array types, (c) Structure types, (d) Union types and (e) Function types.

In this example, you will learn to evaluate the size of each variable using sizeof operator.

To understand this example, you should have the knowledge of the following C programming topics:

C Data Types
C Variables, Constants and Literals
C Input Output (I/O)
The sizeof(variable)operator computes the size of a variable. And, to print the result returned by sizeof, we use either %lu or %zu format specifier.

Program to Find the Size of Variables

 int main() {
      int intType;
      float floatType;
      double doubleType;
      char charType;
 printf("Size of int: %zu bytes\n", sizeof(intType)); 
printf("Size of float: %zu bytes\n", sizeof(floatType));
  printf("Size of double: %zu bytes\n", sizeof(doubleType));
 printf("Size of char: %zu byte\n", sizeof(charType)); 
 return 0;


Size of int: 4 bytes
Size of float: 4 bytes
Size of double: 8 bytes
Size of char: 1 byte


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