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v02-l1-funcCall

What function modifies the value of the original variable passed as argument ?

void function1(double x) {
    x += 1;
}

double function2(double x) {
    return x + 1;
}

double function3(double& x) {
    return x + 1;
}

void function4(double& x) {
    x = x + 1;
}

???

Note that function2 never assigns x to a new value but only returns a value that is computed using the value of x.