Assert and constd13

assert:assert( expression ); If the expression is true, nothing will be done , If false, the program crashes , And remind the crash location , stay debug                The version is valid ,release Automatic failure

Assertions need to reference the assertion header file ：#include<assert.h>

const: Define constant variable

1. Basic types for const It's transparent

const int ca=10; and int const cb=10; Equivalent

2.const Just decorate the right side , Make it read-only

3. Authority can only be transmitted equally or reduced

int main()
{
	int a=10;// Can read but write  
	a=20;//a Yes.  
	int b=a;//a Yes.  
	const int ca=10;// read-only  
	b=ca;
	ca=20;// Report errors  
	int *p=&a;
	p=&b;
	*p=100;
	const int *cp1=&a;
	cp1=&b;// correct  
	*cp1=100;// Report errors  
	int const *cp2=&a;
	cp2=&b;// correct  
	*cp2=100;// Report errors  
	int *const cp3=&a;
	cp3=&b;// Report errors  
	*cp3=100; // correct  
} 

int main()
{
	int a=10;
	int b=20;
	const int ca=10;
	const int cb=20;
	int *p1=&a;// correct 
	*p1=100;
	p1=&b;
	int *p2=&ca;// Report errors    *p2=100; Dereference indirect to ca assignment 
	const int *p3=&a;
	const int *p4=&ca;// Report errors ,*p4 Dereference 
	*p4=100;// Report errors 
	int *const p5=&a;
	int *const p6=&ca;// Report errors 
	const int *const p7=&a; 	 
}