THINK++ — Engineering Visualized

Type Conversion

C++ Type Casting

Type casting is the process of converting one data type into another. C++ supports both implicit and explicit casting.

IMPLICIT (COERCION)

Done automatically by the compiler when there is no data loss.

int i = 10;
double d = i; // 10.0

EXPLICIT (CASTING)

Manually specified by the programmer. Required when data loss may occur.

double d = 10.5;
int i = (int)d; // C-style
int j = static_cast<int>(d);

MODERN C++ CASTS

BEST PRACTICE

Prefer static_cast over C-style casts (int)d because it's more restrictive, easier to find in code, and safer at compile-time.

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