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What is the purpose of the sizeof() operator and how to use it?

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In C language, the sizeof() operator is used to determine the size of a variable in bytes.

Here is an example to show how to use this operator in your program:

#include <stdio.h>
int main() {
    int num;
    float f;
    char c;
    char name[10];
    printf("Size of int: %lu bytes\n", sizeof(num));
    printf("Size of float: %lu bytes\n", sizeof(f));
    printf("Size of char: %lu bytes\n", sizeof(c));
    printf("Size of array: %lu bytes\n", sizeof(name));
    return 0;
The above code returns the following output:
Size of int: 4 bytes
Size of float: 4 bytes
Size of char: 1 bytes
Size of array: 10 bytes