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Warning C6270

  • Article

Missing float argument to 'function-name': add a float argument corresponding to conversion specifier 'number'

Remarks

This warning indicates that not enough arguments are provided to match a format string. At least one of the missing arguments is a floating-point number. This defect can lead to crashes, in addition to potentially incorrect output.

Code analysis name: MISSING_FLOAT_ARGUMENT_TO_FORMAT_FUNCTION

Example

The following code generates warning C6270. sprintf_s expects a second float argument as denoted by %f but none is provided:

void f()
{
    char buff[25];
    sprintf_s(buff, sizeof(buff), "%s %f", "pi: ");
}

To correct this warning, pass the missing float argument as shown in the following code:

void f()
{
    char buff[25];
    sprintf_s(buff, sizeof(buff), "%s %f", "pi: ", 3.14159);
}

See also

Format specification syntax: printf and wprintf functions
sprintf, _sprintf_l, swprintf, _swprintf_l, __swprintf_l
sprintf_s, _sprintf_s_l, swprintf_s, _swprintf_s_l
C4473