《QDebug 2020年5月》

龚建波发布时间：2020-05-17 22:28:27 ，浏览量：3

一、Qt Widgets 问题交流 1.打印浮点数，输出小数精度不对

Qt 和 cout 一样，浮点数输出有效位是 6 ，如果整数有效位数大于等于 6 ，那么就没小数部分了。下图为 Qt 源码的代码片段：

测试如下：

    double a=123456,b=0.1234567;
    std::cout


    
        
        
        
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