既然你已经在你的价值双击，你可以检查它是否是的范围之外浮动：

Since you have your value in a double, you can just check if it's outside of the range of float:

#include <stdlib.h>
#include <stdio.h>
#include <float.h>

int main(int argc, char *argv[])
{
    double d = FLT_MAX;
    if (argc > 1) {
        d = strtod(argv[1], NULL);
    }
    if ((d > 0 && (d > FLT_MAX || d < FLT_MIN))
                || (d < 0 && (d < -FLT_MAX || d > -FLT_MIN)))
        printf("Invalid float: %g\n", d);
    else
        printf("Valid: %g\n", d);

    return EXIT_SUCCESS;
}

运行程序：

$ ./a.out
Valid: 3.40282e+38
$ ./a.out 3.5e38
Invalid float: 3.5e+38
$ ./a.out -1e40
Invalid float: -1e+40

您可能会或可能不会需要添加一个测试为正确的关于strtod（）回归，这取决于是否有溢出的可能性双键入为好。

You may or may not need to add a test for correct strtod() return, depending upon whether there's a possibility of an overflow in double type as well.