7.1/main.c


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

int main(int argc, char *argv[])
{
	char c;

	if (!strcmp(argv[0], "lower"))
		while ((c = getchar()) != EOF)
			putchar(tolower(c));
	else 
		while ((c = getchar()) != EOF)
			putchar(toupper(c));

	return 0;
}