sizeof()和strlen()的检测与对比

//*****sizeof函数的用法******


#include <iostream>
using namespace std;


void printValues(const int ia[], size_t size)
{
for (size_t i = 0; i != size; ++i)
{
cout << ia[i] << endl;
}
}


int main()
{
int j[] = {0,1};
printValues(j, sizeof(j) / sizeof(*j));


cout <<sizeof(j) <<endl;
cout <<sizeof(*j) <<endl;
cout <<endl;


cout <<"sizeof函数的检测："<<endl;
char *str1 = "absde";
char str2[] = "absde";
char str3[8] = {'a'};
char str4[] = "0123456789";
cout <<"前面是sizeof(str1)"<<"\t"<<"后面的strlen(str1)函数作为对比的"<<endl;
cout<<"*str1："<<sizeof(str1)<<"\t\t\t"<<strlen(str1)<<endl;
cout<<"str2："<<sizeof(str2)<<"\t\t\t\t"<<strlen(str2)<<endl;
cout<<"str3："<<sizeof(str3)<<"\t\t\t\t"<<strlen(str3)<<endl;
cout<<"str4："<<sizeof(str4)<<"\t\t\t"<<strlen(str4)<<endl;


cout <<"同时检测到一个字符型占1个字节"<<endl;
cout <<endl;


int a = 123;
int *a1 = &a;
int a2[] = {1,2,3,4,5,6};
int a3[8] = {3};
int a4[] = {0,1,2,3,4,5,6,7,8,9};
cout <<"sizeof(a1): "<<sizeof(a1)<<endl;
cout <<"sizeof(a2): "<<sizeof(a2)<<endl;
cout <<"sizeof(a3): "<<sizeof(a3)<<endl;
cout <<"sizeof(a4): "<<sizeof(a4)<<endl;
cout <<"同时检测到一个整型占4个字节";
cout <<endl;
cout <<endl;


char const keyword[][10] = {"do","for","if","register","return","switch","while"};
cout<< sizeof(keyword)<<endl;//整个数组的长度
cout<< sizeof(keyword[0])<<endl;//每个元素所占的字节
cout<< sizeof(keyword) / sizeof(keyword[0])<<endl;//数组元素的个数


system("pause");
}