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
#include<stdio.h>
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;
}
Output
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.