C + + Get array length

1. Get the character array length

Char a[]= "abcdef";

int length1=sizeof (a)/sizeof (a[0]);
cout<< "a" <<length1<<endl;

Length1 is 7.

cout<< "A" <<strlen (a) <<endl;

Output 6

Note: string cannot be used with the strlen function

2. Get string length

#include <string>
#include <iostream>
using namespace Std;
int main ()
{
String str = "ABCDEF";
cout << str.length () << Endl;
cout << str.size () << Endl;
return 0;
}

Output is 6

3. Get int Array length

int marks[5] = {40, 90, 73, 81, 35};
int length1=sizeof (marks)/4;
cout<< "a" <<length1<<endl;

Output is 5, actual length

Get the two-dimensional array length:

int marks[2][3]={1,2,3,4,5,6};
int length1=sizeof (marks[0])/4;
cout<< "a" <<length1<<endl;
int length2=sizeof (marks)/4;
cout<< "a" <<length2<<endl;

Output 3, and 6

C + + Get array length