Sizeof Operator

The memory size (in bytes) of a data type or a variable can be found with the sizeof operator:

    
        #include<stdio.h>

        int main() {
            int myInt;
            float myFloat;
            double myDouble;
            char myChar;

            printf("%lu\n", sizeof(myInt));
            printf("%lu\n", sizeof(myFloat));
            printf("%lu\n", sizeof(myDouble));
            printf("%lu\n", sizeof(myChar));
            return 0;
        }
    

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• Note that we use the %lu format specifer to print the result, instead of %d.
• It is because the compiler expects the sizeof operator to return a
• long unsigned int (%lu), instead of int (%d). On some computers it might work with %d, but it is safer to use %lu.