pvjc24/cv1/program.c

#include <stdio.h>

int main() {
    int c = 0;
    int lines_count = 0;
    int was_newline = 0; 
    while ((c = getchar()) != EOF) {
       
        was_newline = 0;

       
        if (c >= 'a' && c <= 'z') {
            c = c - 'a' + 'A';
        }
    
        else if (c >= 'A' && c <= 'Z') {
            c = c - 'A' + 'a';
        }
       
        if (c == '\n') {
            lines_count++;
            was_newline = 1;
        }

        putchar(c);
    }

    
    if (!was_newline && c != EOF) {
        putchar('\n');
    }

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

    return 0;
}