• JS

let z = 0, n, d, i, a
if ((i = f.indexOf(' ')) != -1) {
    z = parseInt(f.substring(0, i))
    f = f.substring(++i).trim()
}
i = f.indexOf('/')
n = parseInt(f.substring(0, i))
d = parseInt(f.substring(++i))
a = z + (n / d)

• Java

String s[] = f.split("[ /]");
int m = s.length,
    n = parseInt(s[m - 2]),
    d = parseInt(s[m - 1]);
double a = ((double) n / d);
if (m > 2) a = a + parseInt(s[0]);

• Java

String s[] = f.split("[ /]");
int m = s.length;
BigDecimal n = new BigDecimal(s[m - 2]),
           d = new BigDecimal(s[m - 1]),
           a = n.divide(d, DECIMAL128);
if (m > 2) a = a.add(new BigDecimal(s[0]));

• Pascal

a := f.ToFloat;

• Python

s = split('[ /]', f)
*i, n, d = map(int, s)
a = sum(i, n / d)

• Python

a = map(Fraction, f.split())
a = sum(map(float, a))

• Ruby

a = f.split.map(&:to_r).sum.to_f