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I was interested to format the loan amount when the result of the mortgage repayment calculation is displayed and I came across this code (which I modified a little). And thanks to the author whose name I don't know. It takes a value in a double and returns a string formatted for currency with two decimal places. Thought I'd post it for what it's worth. #include <string> std::string formatCurrency(double dv) { const std::string radix = "."; const std::string thousands = ","; const std::string unit = "$"; unsigned long v = (unsigned long) ((dv * 100.0) + .5); std::string fmt,digit; int i = -2; // number of decimal places - DO NOT CHANGE!! do { if(i == 0) { fmt = radix + fmt; } if((i > 0) && (!(i % 3))) { fmt = thousands + fmt; } digit = (v % 10) + '0'; fmt = digit + fmt; v /= 10; i++; } while((v) || (i < 1)); std::string rv; rv = unit + fmt; return rv; } Cheers from Oz.