assignment operator "="

• syntax: expr1 = expr1

e.g. a=2.0; a=b=c=0; ? a=(b=(c = 0));

• other (op=) combinations: e.g. += ,-= ,*= ,/= ,%=

• syntax: expr1 op= expr2

• semantic: ? expr1 = (expr1) op (expr2)

e.g. j *= k + 3 ? j = j * (k + 3)

y <<= 2 ? y = y << 2

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