pvjc24/cv1/program.c

#include <stdio.h>

int main() {
    int ch;
    int line_count = 0;
    while ((ch = getchar()) != EOF) {
        if (ch == '\n') {
            putchar('\n');
            line_count++;
        } else {
            if (ch >= 'a' && ch <= 'z') {
                putchar(ch - 32); 
            } else if (ch >= 'A' && ch <= 'Z') {
                putchar(ch + 32); 
            } else if ((ch >= 32 && ch < 127) || ch==9){
                putchar(ch);
            }
        }
    }

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

    return 0;
}