pvjc22/du1/program.c

#include <stdio.h>

int main(){
	int c = 0;
	int big;
	char d;
	while( c != EOF){
		c = getchar();
		if (c >= 'a' && c <= 'z'){
			big = c - 'a' + 'A';
			d = big;
			c = d;
		}
		putchar (c);
	}
	return 0;
}