PVJC25/a1/program.c

#include <stdio.h>

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