Express a number in decimal as a fixed-length string with leading zeros.

For example, the number 7.125 could be expressed as “00007.125”.

#include <iostream> #include <iomanip> int main() { std::cout << std::setfill('0') << std::setw(9) << std::fixed << std::setprecision(3) << 7.125 << std::endl; return 0; }

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