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代码： 全选

#include "stdio.h"
#include "ctype.h"

int main(int argc, char const *argv[])
{
	int ch;
	int upper_count, lower_count;
	upper_count = lower_count = 0;

	while ((ch = getchar()) != EOF) {
		if (islower(ch) == 1) {
			lower_count++;
		} else if (isupper(ch) == 1) {
			upper_count++;
		} else {
			continue;
		}
	}

	printf("lowercase number: %5d, uppercase number: %5d\n", lower_count, upper_count);
	return 0;
}