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Answer 
Built in data types
char: For characters. Size 1 byte.
char ch = 'A';
int: For integers. Size 2 bytes.
int num = 100;
float: For single precision floating point. Size 4 bytes.
float num = 123.78987;
double: For double precision floating point. Size 8 bytes.
double num = 10098.98899;
bool: For booleans, true or false.
bool b = true;
wchar_t: Wide Character. This should be avoided because its size is implementation defined and not reliable.
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