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C Language > Learn C Language > How do you define and use a union in C?
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How do you define and use a union in C?

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A union is a special data type available in C that allows to store different data types in the same memory location. You can define a union with many members, but only one member can contain a value at any given time. Unions provide an efficient way of using the same memory location for multiple-purp...
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A union is a special data type available in C that allows to store different data types in the same memory location. You can define a union with many members, but only one member can contain a value at any given time. Unions provide an efficient way of using the same memory location for multiple-purpose. read less
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I have 10 years experience in teaching C, C++, Java, Python, tally, Ms-Excel, SQL.

Union can be defined as a user-defined data type which is a collection of different variables of different data types in the same memory location. Union is a user-defined data type, but unlike structures, they share the same memory location union student { int rno, m1,m2; char name; float avg; }...
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Union can be defined as a user-defined data type which is a collection of different variables of different data types in the same memory location. Union is a user-defined data type, but unlike structures, they share the same memory location union student { int rno, m1,m2; char name[50]; float avg; } c1; void main() { Scanf(“%d”, &c1.rno); Scanf(“%d”, &c1.m1); Scanf(“%d”, &c1.m2); Scanf(“%s”, &c1.name); c1.avg = (c1.m1 + c1.m2) / 2; } read less
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