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int integer_divide(int a, int b) { int neg = 1; int ret = 0; if (a < 0) { a = -a; neg = -neg; } if (b < 0) { b = -b; neg = -neg; } while (a >= b) { a -= b; ++ret; } return ret * neg;}

Any mathematical function beyond addition and subtraction must be done with a algorithm using addition and subtraction ONLY,