Who likes unicode allcaps???

mathcaps.c

/*
Compile: make mathcaps
Usage: ./mathcaps "the string to convert"
*/

#include <stdio.h>
#include <string.h>

int main(int argc, char** argv) {

	char* s = argv[1];
	int len = strlen(s);
	for (int i = 0; i < len; ++i)
	{
		if (s[i] == ' ') {
			printf(" ");
			continue;
		}
		char c = s[i] - 'a';
		if (c < 0) c = s[i] - 'A'; 
		if (c < 0 || c > 25) continue;
		printf("\xF0\x9D\x90%c", 0x80+c);
	}
	printf("\n");
	return 0;
}