📘 Lesson · Lesson 58

Structure vs Union

Structure and Union

💡 Note

Both group different data types. A structure gives each member its own memory; a union shares one memory space for all members.

Comparison

Structure	Union
each member separate memory	all members share memory
all members usable together	only one member at a time
larger size	size of largest member

Example

struct S { int a; char b; };   // separate memory
union U { int a; char b; };    // shared memory
printf("%lu %lu", sizeof(struct S), sizeof(union U));

Output:
8 4

Summary

Structure = separate memory per member; union = shared memory (one at a time).

Structure और Union

💡 Note

दोनों अलग data types group करते हैं। Structure हर member को अलग memory देता है; union सभी members के लिए एक memory share करता है।

तुलना

Structure	Union
हर member अलग memory	सभी members memory share
सभी members एक साथ usable	एक समय एक member
बड़ा size	सबसे बड़े member का size

Example

struct S { int a; char b; };   // अलग memory
union U { int a; char b; };    // shared memory
printf("%lu %lu", sizeof(struct S), sizeof(union U));

Output:
8 4

सारांश

Structure = हर member अलग memory; union = shared memory (एक समय एक)।

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