CODEWITHSUNDEEP
c++cvisual-studio-2008visual-c++c++11
Robert
Robert

Reputation: 13

When I using variable parameters, it works well with int and double, but when it comes to float, error happens

When I using variable parameters, it works well with int and double, but when it comes to float, error happens.

Here is the code.

void vaParamTest(int a, ...)
{
    va_list ap;
    va_start(ap, a);
    for (int  i = 0; i < a; i++)
        printf("%f\t", va_arg(ap, float));
    putchar('\n');
    va_end(ap);
}

I pass parameters like this.

vaParamTest(3, 3.5f, 8.3f, 5.1f);

Upvotes: 0

Views: 171

Answers (1)

Kerrek SB
Kerrek SB

Reputation: 477308

Variables that are passes as variadic function arguments are default-promoted, which makes all floats into doubles. You can never have a float argument (just like you can never have a char argument). In printf, %f always means double.

Upvotes: 9

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