Is there any way to print the integer along with its sign in c++...i.e. by default if the number is negative we would get a - sign printed. In the same way can we get + before the positive numbers.
int x=-1;
cout<<"x="<<x;
gives output x=-1
but,..
int x=+1;
cout<<"x="<<x;
gives output as x=1 but how do i get it printed as x=+1
I know we can take cases by using if-else for x>0 and x<0;..but without using the if-else is there any direct way of printing in c++
C++20 std::format option +
According to https://en.cppreference.com/w/cpp/utility/format/formatter#Standard_format_specification the following should hold:
#include <format>
// "1,+1,1, 1"
std::cout << std::format("{0:},{0:+},{0:-},{0: }", 1);
// "-1,-1,-1,-1"
std::cout << std::format("{0:},{0:+},{0:-},{0: }", -1);
The existing fmt library implements it for before it gets official support: https://github.com/fmtlib/fmt Install on Ubuntu 22.04:
sudo apt install libfmt-dev
Modify source to replace:
<format> with <fmt/core.h>std::format to fmt::formatmain.cpp
#include <iostream>
#include <fmt/core.h>
int main() {
std::cout << fmt::format("{0:},{0:+},{0:-},{0: }\n", 1);
std::cout << fmt::format("{0:},{0:+},{0:-},{0: }\n", -1);
}
and compile and run with:
g++ -std=c++11 -o main.out main.cpp -lfmt
./main.out
Output:
1,+1,1, 1
-1,-1,-1,-1
More information at: std::string formatting like sprintf
How about:
cout<<"x="<<(x>0)?"+":""<<x;
it's a bit clumsy, but fits the bill
