pvjc25/a1/program.c

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

void funkcia (int c, int *line_count) {
    if (c == '\n') {
        (*line_count)++;
        putchar(c);
    } else if (isalpha(c)) {
        putchar(islower(c) ? toupper(c) : tolower(c));
    } else if (isprint(c)) {
        putchar(c);
    }
}

int main() {
    int c;
    int c2 = 0;
    while ((c = getchar()) !=EOF) {
        funkcia(c, &c2);
    }
    printf("\nLines count: %d\n", c2);
    return 0;
}