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How do we change the data type of a variable after its declaration in C?

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can be with Explicit or Implicit conversion of data. int x=10; Float z = x+25.5; Here, int is implicitly converted into float.
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I have 10 years experience in teaching C, C++, Java, Python, tally, Ms-Excel, SQL.

using type conversion example float x=1.5; y=int(x);
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