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cplusplus17.Examples/examples/ucase_stdin/stdin_stdout.cpp
Source: cplusplus17.Examples/examples/ucase_stdin/stdin_stdout.cpp
#include<iostream>
#include<cctype>
#include<cstdlib>

// uppercase standard input stream
int main() {
    while(!std::cin.eof()) {
        int c = std::cin.get();
        std::cout << static_cast<char>(toupper(c));
    }
	return 0;
}