How does this output came?

Question

Problem related to structure in c
https://code.sololearn.com/cq6Zxd8bgcM7/?ref=app

Answer 1

The output is: 4 3 2 1. In C, a union is a data structure that holds multiple variables in the same memory location, but only one variable can be used at a time. In this case, the union named "det" has two variables, "data" and "value". "data" is assigned the value 0X01020304, which is equivalent to 16909060 in decimal. When printing the elements of the "value" array, each element corresponds to a byte of the value assigned to "data". The order of the bytes is determined by the endianness of the system; in this case, it seems to be little-endian, meaning that the least significant byte is stored first, so, det.value[0] = 4, det.value[1] = 3, det.value[2] = 2, and det.value[3] = 1.