All the sources codes "But why ?"page 15

void menu() {
    char input;
    // something into input...
    switch(input) {
        case '1':
            // ......
            printf(".......");
            break;
        case '2':
            //......
            main(); // go back to menu
            break;
    // (omitted)

int main() {
    menu();
    return 0;
}

char * typeOfFile(int t){
    if(t=0)
        return "Text";
    else
        return "Image";
}

if (numCotRemovidas > 0){
	int nada = 0;
	int x = nada;
}