pvjc24/cv1/program.c

#include <stdio.h>

char simulate_caps_lock(char c) {
    if ('a' <= c && c <= 'z') {
        return c - ('a' - 'A');
    } else if ('A' <= c && c <= 'Z') {
        return c + ('a' - 'A');
    } else {
        return c;
    }
}

int main() {
    char c;
    int line_count = 0;

    while (1) {
        int input = getchar();

        if (input == EOF) {
            return -1;
        }

        c = (char)input;
        c = simulate_caps_lock(c);

        putchar(c);

        if (c == '\n') {
            line_count++;
        }
    }

    printf("%d\n", "Lines count: "line_count);

    return 0;
}