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c-calc supports five arithmetic operators: addition (+), subtraction (-), multiplication (*), division (/), and modulo (%). All results are computed in double-precision floating point and printed with four decimal places using the %.4f format specifier. This page documents the behavior of each operator, including edge cases such as division by zero and modulo with floating-point inputs.

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Output format

Regardless of operator, every result is displayed as: 
Result: <value>.0000
For example, 7 / 2 yields Result: 3.5000, and 6 + 0 yields Result: 6.0000.

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Operator reference

Returns the sum of the two operands as a double.
./c-calc 3 + 4

Result: 7.0000

double add(double a, double b) {
    return a + b;
}
Returns the difference of the two operands as a double. The result is negative when the second operand is larger than the first.
./c-calc 10 - 3

Result: 7.0000

double subtract(double a, double b) {
    return a - b;
}
Returns the product of the two operands as a double.
./c-calc 6 '*' 7

Result: 42.0000
In most shells, * must be quoted to prevent glob expansion. Use single quotes ('*'), double quotes ("*"), or a backslash escape (\*).
double multiply(double a, double b) {
    return a * b;
}
Returns the quotient of the two operands as a double.
./c-calc 22 / 7

Result: 3.1429
When the divisor is 0, c-calc prints Divide by 0 error (without a trailing newline) and returns 0 instead of crashing or exiting with an error code.
./c-calc 9 / 0

Divide by 0 errorResult: 0.0000

double divide(double a, double b) {
    if (b == 0) {
        printf("Divide by 0 error");
        return 0;
    }
    return a / b;
}
Returns the integer remainder after dividing the first operand by the second.
./c-calc 7 % 3

Result: 1.0000
Both operands are truncated to int before the modulo operation is applied, regardless of whether they were supplied as decimals. For example, 7.9 % 3.9 is computed as 7 % 3, which equals 1.
case '%':
    int whole_first = first;
    int whole_second = second;
    result = whole_first % whole_second;
    break;
The truncation follows C’s behavior for converting double to int, which discards the fractional part (truncation toward zero).

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Unknown operator

If the operator character passed to calculate() does not match any of the five cases, the switch statement falls through to its default branch: 
Unknown operator
The function returns -1, so the printed result is: 
Result: -1.0000
This applies in both interactive and non-interactive mode.

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