pvjc25/a1/program.c

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

int main(){
    int ch;
    int line_count = 0;
    
    while((ch = getchar()) != EOF){
        if(islower(ch)){
           putchar(toupper(ch));
        }else if(isupper(ch)){
           putchar(tolower(ch));
        }else{
            putchar(ch);
            if(ch == '\n'){
               line_count++;
            }
        }
    }
    
    printf("Pocet nacitanych riadkov: %d\n", line_count);
    return 0;
}