代码在c中工作但在c ++中不工作

Question

The following code is working fine in C but when I try to write it in c++ then the program does not work.Please explain.

C code :

#include<stdio.h>
#include<stdlib.h>

int main()
{
    int a = 33,b = 7;
    printf("%d\n",a&b);
    return 0;
}

C++ code:

#include<iostream>

using namespace std;

int main()
{
    int a = 33,b = 7;
    cout << 33&7 << endl;
    return 0;
}

Answer 1

Watch your operator precedence:

cout << (33 & 7) << endl;

& has lower precedence than << . So you need to use () .

---

For the full list of operator precedence in C and C++:

http://en.wikipedia.org/wiki/Operators_in_C_and_C%2B%2B#Operator_precedence

Answer 2

This question nothing has nothing to do with the difference between C and C++. This is about the precedence of the operators and deciding where the borders of the expression are. The right example should look like:

printf("%d\n", a&b);

and

short cout;
int endl;
long var = cout << 33 & 7 << endl;

The fact, that C++ I/O advises to use << for printing variables is not important. C++ says that the precedence of the overloaded ops is the same as the precedence of regular operators.

Answer 3

Your lines will be explained to:

(cout <<33)&(7<<endl);

It should be:

cout << (33&7) << endl;