main.cpp

易学c++程序实例 本章主要讲述一些学习程序设计前需要了解的一些知识和一些学习程序设计的方法。并且对 C++语言作了一个简要的介绍。学好这一章

#include "iostream.h"
int abs(int a);
float abs(float a);
double abs(double a);
char abs(char a);
void main()
{
	int a=-5,b=3;
	float c=-2.4f,d=8.4f;
	double e=-3e-9,f=3e6;
	cout <<"a=" <<abs(a) <<endl <<"b=" <<abs(b) <<endl;
	cout <<"c=" <<abs(c) <<endl <<"d=" <<abs(d) <<endl;
	cout <<"e=" <<abs(e) <<endl <<"f=" <<abs(f) <<endl;
}
int abs(int a)
{
	cout <<"int abs" <<endl;
	return (a>=0?a:-a);
}
float abs(float a)
{
	cout <<"float abs" <<endl;
	return (a>=0?a:-a);
}
double abs(double a)
{
	cout <<"double abs" <<endl;
	return (a>=0?a:-a);
}
char abs(char a)
{
	cout <<"char abs" <<endl;
	return (a>=0?a:-a);
}