sizeof() operator, Returns the size of a variable.

C Programming Language Operators and Enums in C Language (Article) Operators and Enums in C Language (Program)

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Program:

#include <stdio.h>
int main()
{
    int a, e[10];
    float b;
    double c;
    char d;
    printf("Size of int=%lu bytes\n",sizeof(a));
    printf("Size of float=%lu bytes\n",sizeof(b));
    printf("Size of double=%lu bytes\n",sizeof(c));
    printf("Size of char=%lu byte\n",sizeof(d));
    printf("Size of integer type array having 10 elements = %lu bytes\n", sizeof(e));
    return 0;
}

Output:

Size of int=4 bytes
Size of float=4 bytes
Size of double=8 bytes
Size of char=1 byte
Size of integer type array having 10 elements = 40 bytes
Press any key to continue . . .

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