pvjc24/cv1/program.c

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

int main() {
    char ch;
    int line_count = 0;
    while ((ch = getchar()) != EOF) {
        if (ch == '\n') {
            putchar('\n');
            line_count++;
        } else {
            if (isprint(ch)) {
                putchar((ch >= 'a' && ch <= 'z') ? (ch - 32) : ((ch >= 'A' && ch <= 'Z') ? (ch + 32) : ch));
            }
            else {
                putchar(ch);
            }
        }
    }
    
    printf("\nLines count: %d\n", line_count);

    return 0;
}