How to keep 2 decimal places in output without rounding in c++

In C, to preserve two decimal places in the output without rounding, you can use the following steps: Use std::fixed to represent floating point numbers with a fixed number of decimal places. Use std::setprecision() to set the number of decimal places to retain, including the decimal point.

How to retain 2 decimal places in C output without rounding

In C, 2 decimal places must be retained To output without rounding, use thestd::fixedandstd::setprecision()functions.

1. std::fixed

std::fixedRepresents a floating point number as a fixed number of decimal places. By default, floating point numbers are represented in scientific notation, whilestd::fixedconverts them to decimal notation, preserving the specified number of digits.

2. std::setprecision()

std::setprecision()Set the number of decimal places to be retained. For floating point numbers,std::setprecision()Specifies the number of decimal places to display, including the decimal point.

Sample code:

#include  #include  using namespace std; int main() { double value = 123.4567; // 保留 2 位小数输出而不四舍五入 cout << fixed << setprecision(2) << value << endl; return 0; }

Output:

123.45

In this example,std::fixedConvertsvalueto decimal notation whilestd::setprecision(2)specifies that 2 decimal places be preserved. Therefore, the output is rounded to 2 decimal places without rounding.

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