C Typecasting

Automatic Typecasting

The conversions that make sense are:

• int ←> char
• int ←> float
• int ←> bool Automatic typecasting occurs in C Binary Operator Typecasting

Explicit Typecasting

If you have 2 datatypes. c and i, an explicit typecast of c = i will:

• Make the right operand the same type as the left operand
• For high → low(consult C Binary Operator Typecasting), excess high-order bits are discarded.
• For low → high, the value of the lower remains unchanged.

int i;
char c;
i = c; // lower char -> higher int
c = i; // higher int -> lower char

Coerced Typecasting

(type-name) expression example is: (double) n

Custom Typecasts

• atoi()
• tolower()