The starter scale.c refuses to build because it never reads one of its parameters: repair it so scale returns the product of value and factor.

• scale receives two int parameters, value and factor.
• Return the product of value and factor.
• A factor of 1 gives value back unchanged, and a zero on either side gives 0.
• A negative value or a negative factor is ordinary input: the sign follows the usual rules of multiplication.
• The tests only pair 2147483647 and -2147483648 with a factor of 1 or 0, so every product fits in an int and you never have to guard against overflow.
• Your first run stops at the compile stage instead of showing a red test. The grader builds with -Wextra -Werror, so unused parameter 'factor' is reported as an error, not a warning.
• A parameter you want to ignore on purpose is silenced in C by writing (void)factor; in the body, which is how the empty starters elsewhere in the catalog manage to build. Here factor belongs in the computation, so the fix is to multiply by it.

The starter scale.c refuses to build because it never reads one of its parameters: repair it so scale returns the product of value and factor.

• scale receives two int parameters, value and factor.
• Return the product of value and factor.
• A factor of 1 gives value back unchanged, and a zero on either side gives 0.
• A negative value or a negative factor is ordinary input: the sign follows the usual rules of multiplication.
• The tests only pair 2147483647 and -2147483648 with a factor of 1 or 0, so every product fits in an int and you never have to guard against overflow.
• Your first run stops at the compile stage instead of showing a red test. The grader builds with -Wextra -Werror, so unused parameter 'factor' is reported as an error, not a warning.
• A parameter you want to ignore on purpose is silenced in C by writing (void)factor; in the body, which is how the empty starters elsewhere in the catalog manage to build. Here factor belongs in the computation, so the fix is to multiply by it.