pvjc24/cv1/program.c

#include <stdio.h>

int main() {
    char ch;
    int line_count = 0;

    while ((ch = getchar()) != EOF) {
        if (ch == '\n') {
            line_count++;
        } else if ((ch >= 'a' && ch <= 'z') || (ch >= 'A' && ch <= 'Z')) {
            putchar((ch >= 'a' && ch <= 'z') ? (ch - 32) : (ch + 32));
        } else if (ch >= 32 && ch <= 126) {
            putchar(ch);
        }
    }
    
    putchar('\n');
    printf("Lines count: %d\n", line_count);

    return 0;
}