c - 如何使用隐式和显式强制转换？

Question

Possible Duplicate:
Identify the implicit cast and explicit cast

int a = 2, b = 3;
float f = 2.5;
double d = -1.2;

int int_result;
float real_result;

real_result = a * f;
real_result = (float) a * b;
d = a + b / a * f;
d = f * b / a + a;

Answer 1

如果没有丢失信息，编译器将提升您的数据类型:

int a=3;
float b=a; //b=3.0f

如果存在信息丢失，编译器应降级并发出警告:

float b=4.3;
int a=b;  //a=4

[

short a=2000;
int b;
b = (int) a;    // c-like cast notation
b = int (a);    // functional notation

] 1