Program 1 #include Program 3 #include int main(void) { double x = 9.0; double y = sqrt(x); double square (double x) { return (x * x); } printf("SQRT(%lf) is %lf. ", x, y); return; int main(void) { double x = 3.2; int y; } y = square(x); printf("%lf squared: %lf. ", x, y); Program 2 #include #include return 0; } int main(void) { double x = 3.0; double y = 4.0; printf("The sum is %lf. ", x - y); return; }