Join our newsletter for the latest updates.

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

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:

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;

    // sizeof evaluates the size of a variable
    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

In this program, 4 variables intType, floatType, doubleType and charType are declared.

Then, the size of each variable is computed using the sizeof operator.