Simple bit set example

[frek]

In this piece of code:

#include <iostream>

template<typename T>
void print(T t) { std::cout << t << ' '; }

int main() {

	int si = 128; // doesn’t fit into a char
	char c = si; // implicit conversion to char
	unsigned char uc = si;
	signed char sc = si;

	print(si); print(c); print(uc); print(sc); std::cout << '\n';

	si = 128; // doesn’t fit into a signed char
	c = si;
	uc = si;
	sc = si;
	print(si); print(c); print(uc); print(sc); std::cout << '\n';

	system("pause");
	return 0;
}

I expect to get:

128 -128 128 -128
128 -127 129 -127

But I get this one the console:

128 € € €
128 € € €

Why, please?

[jonnin]

add a cast to int in print and I get:
C:\c>a
128 -128 128 -128
128 -128 128 -128

so one answer is that it printed as characters, not integers.
but as to the values, not sure what you are trying to see.

[lastchance]

https://www.cplusplus.com/reference/cctype/isprint/

[seeplus]

Well with VS and Windows, I get a display of:

128 Ç Ç Ç
128 Ç Ç Ç

which is sort of what I expected as c, uc and sc are type char and so are displayed as chars. I also get a bunch of warnings about conversion from int to char and possible loss of data.

If you want the display to be as a number rather than a char, then you need to display as type int/unsigned int as required.

By changing print() to:

void print(int t) { std::cout << t << ' '; }

I get:

128 -128 128 -128
128 -128 128 -128

With both lines the same as L8 and L15 do the same.