long long in C/C++

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The letters 100000000000 make up a literal integer constant, but the value is too large for the type int. You need to use a suffix to change the type of the literal, i.e.

long long num3 = 100000000000LL;

The suffix LL makes the literal into type long long. C is not “smart” enough to conclude this from the type on the left, the type is a property of the literal itself, not the context in which it is being used.

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