Union in C Language

O LEVEL -PAPER 3rD -- M3-R4

C  LANGUAGE

UNION IN C 

union defination

DIFFERENTIATE BETWEEN STRUCTURE AND UNION 

Different between structure and union

most important different between structure and union is that it's memory consumption in program i.e structure consume memory seperately i.e 2byte for int and 4byte for float and 1byte for char therefore total 5byte but The Union conducts only the largest bytes or data type in memory i.e in above example largest byte is float so it's used 4byte variable only and access all data type variable in 4byte at a time .



HOW TO ACCESS UNION ?

Access of union in c

EXAMPLE OF UNION IN C

Example of union in c

NOTE :- 

Remember that in the quotation given above, we can only use the one value of the one variable at a time i.e int x=5 or float y=3.5 or char z=a as we seen in above example i.e we initialize one value and print it like x=5 and again initialize y=3.5 and print it and initialize again  z='a' and print it and all variable memory will be float type  that's why it's output will be shown on screen is --

OUTPUT -

X=5

Y=3.5

Z=a