I have this code that replaces the {0} and {1} in the string "The number {0} is greater than {1}" with 0 and 1 being the index of a list of variable arguments, but if inside the { } their is a specifier added, {0:[specifier]}, c for currency, f for fixed, i for int, or e for scientific, the number also gets formatted that way. The code is only working if the specifiers are the same, "The number {0:[c]} is greater than {1:[c]}", if they are different, "The number {0:[c]} is greater than {1:[f]}", then the result for some reason is both are formatted in whichever way the second index is, in the example i gave both would be formatted as fixed. I don't know why the second specifier is affecting both numbers, the values don't change but the second specifier affects both values. any one have any ideas?
I don't understand the issue, because when the program reaches the line
if(prompt.find(c2) != std::string::npos)
prompt has been modified once already so there should only be one {index:[specifier]} to be found because the first one was already replaced. Am i off on this line of thinking?
#include <iostream>
#include <iomanip>
#include <string>
#include <cstdarg>
#include <sstream>
using namespace std;
void write(string prompt, ...);
int ConvertCharToInt(char c);
void main()
{
write("The number {0:[i]} is greater than {1:[i]}.\n", 5.9, 1.3, 4.7, 6.8);
}
void write(string prompt, ...)
{
char c1, c2;
int pos1, pos2, num1, num2, temp;
double arg1, arg2;
va_list arguments;
va_start(arguments, prompt);
pos1 = prompt.find_first_of("{");
c1 = prompt.at(pos1+1);
pos2 = prompt.find_last_of("{");
c2 = prompt.at(pos2+1);
num1 = ConvertCharToInt(c1);
num2 = ConvertCharToInt(c2);
for(int i = -1; i < num1; i++)
{
arg1 = va_arg(arguments, double);
}
for(int i = num1; i < num2; i++)
{
arg2 = va_arg(arguments, double);
}
if(prompt.find(c1) != std::string::npos)
{
if(prompt.find("[c]") != std::string::npos)
{
ostringstream a;
a << fixed << setprecision(2) << arg1;
string r1 = "$" + a.str();
size_t pos = prompt.find_first_of("{");
prompt = prompt.replace(pos, 7, r1);
}
else if(prompt.find("[e]") != std::string::npos)
{
ostringstream a;
a << scientific << arg1;
string r1 = a.str();
size_t pos = prompt.find_first_of("{");
prompt = prompt.replace(pos, 7, r1);
}
else if(prompt.find("[f]") != std::string::npos)
{
ostringstream a;
a << fixed << setprecision(6) << arg1;
string r1 = a.str();
size_t pos = prompt.find_first_of("{");
prompt = prompt.replace(pos, 7, r1);
}
else if(prompt.find("[i]") != std::string::npos)
{
ostringstream a;
a << (int)(arg1+.5);
string r1 = a.str();
size_t pos = prompt.find_first_of("{");
prompt = prompt.replace(pos, 7, r1);
}
else
{
ostringstream a;
a << arg1;
string r1 = a.str();
size_t pos = prompt.find_first_of("{");
prompt = prompt.replace(pos, 3, r1);
}
}
if(prompt.find(c2) != std::string::npos)
{
if(prompt.find("[c]") != std::string::npos)
{
ostringstream s;
s << fixed << setprecision(2) << arg2;
string r2 = "$" + s.str();
size_t pos2 = prompt.find_last_of("{");
prompt = prompt.replace(pos2, 7, r2);
}
else if(prompt.find("[e]") != std::string::npos)
{
ostringstream s;
s << scientific << arg2;
string r2 = s.str();
size_t pos2 = prompt.find_last_of("{");
prompt = prompt.replace(pos2, 7, r2);
}
else if(prompt.find("[f]") != std::string::npos)
{
ostringstream s;
s << fixed << setprecision(6) << arg2;
string r2 = s.str();
size_t pos2 = prompt.find_last_of("{");
prompt = prompt.replace(pos2, 7, r2);
}
else if(prompt.find("[i]") != std::string::npos)
{
ostringstream s;
s << (int)(arg2+.5);
string r2 = s.str();
size_t pos2 = prompt.find_last_of("{");
prompt = prompt.replace(pos2, 7, r2);
}
else
{
ostringstream s;
s << arg2;
string r2 = s.str();
size_t pos2 = prompt.find_last_of("{");
prompt = prompt.replace(pos2, 7, r2);
}
}
cout << prompt << "\n";
va_end(arguments);
}
int ConvertCharToInt(char c)
{
int num;
switch(c)
{
case '0':
num = 0;
break;
case '1':
num = 1;
break;
case '2':
num = 2;
break;
case '3':
num = 3;
break;
case '4':
num = 4;
break;
case '5':
num = 5;
break;
case '6':
num = 6;
break;
case '7':
num = 7;
break;
case '8':
num = 8;
break;
case '9':
num = 9;
break;
default:
exit(EXIT_FAILURE);
}
return num;
}
The problem is the consecutive search for your identifiers like [i], [f] and so on.
If u have at the end a [f] string.find() will ALWAYS find [f] and then leave your if-else-branches. So because the [f] branch is before the [i] branch you find in your example always [f] and print the corresponding format.
The solution is to quit seeking the whole [f] expression but to seek only for "[".
I actually got it to work with this, its extremely long and tedious but it works.
if(prompt.find("[c]") != std::string::npos)
{
ostringstream a;
a << fixed << setprecision(2) << arg1;
string r1 = "$" + a.str();
size_t pos = prompt.find_first_of("{");
prompt = prompt.replace(pos, 7, r1);
if(prompt.find("[c]") != std::string::npos)
{
ostringstream s;
s << fixed << setprecision(2) << arg2;
string r2 = "$" + s.str();
size_t pos2 = prompt.find_last_of("{");
prompt = prompt.replace(pos2, 7, r2);
}
else if(prompt.find("[e]") != std::string::npos)
{
ostringstream s;
s << scientific << arg2;
string r2 = s.str();
size_t pos2 = prompt.find_last_of("{");
prompt = prompt.replace(pos2, 7, r2);
}
else if(prompt.find("[f]") != std::string::npos)
{
ostringstream s;
s << fixed << setprecision(6) << arg2;
string r2 = s.str();
size_t pos2 = prompt.find_last_of("{");
prompt = prompt.replace(pos2, 7, r2);
}
else if(prompt.find("[i]") != std::string::npos)
{
ostringstream s;
s << (int)(arg2+.5);
string r2 = s.str();
size_t pos2 = prompt.find_last_of("{");
prompt = prompt.replace(pos2, 7, r2);
}
else
{
ostringstream s;
s << arg2;
string r2 = s.str();
size_t pos2 = prompt.find_last_of("{");
prompt = prompt.replace(pos2, 7, r2);
}
}
else if(prompt.find("[e]") != std::string::npos)
{
ostringstream a;
a << scientific << arg1;
string r1 = a.str();
size_t pos = prompt.find_first_of("{");
prompt = prompt.replace(pos, 7, r1);
if(prompt.find("[c]") != std::string::npos)
{
ostringstream s;
s << fixed << setprecision(2) << arg2;
string r2 = "$" + s.str();
size_t pos2 = prompt.find_last_of("{");
prompt = prompt.replace(pos2, 7, r2);
}
else if(prompt.find("[e]") != std::string::npos)
{
ostringstream s;
s << scientific << arg2;
string r2 = s.str();
size_t pos2 = prompt.find_last_of("{");
prompt = prompt.replace(pos2, 7, r2);
}
else if(prompt.find("[f]") != std::string::npos)
{
ostringstream s;
s << fixed << setprecision(6) << arg2;
string r2 = s.str();
size_t pos2 = prompt.find_last_of("{");
prompt = prompt.replace(pos2, 7, r2);
}
else if(prompt.find("[i]") != std::string::npos)
{
ostringstream s;
s << (int)(arg2+.5);
string r2 = s.str();
size_t pos2 = prompt.find_last_of("{");
prompt = prompt.replace(pos2, 7, r2);
}
else
{
ostringstream s;
s << arg2;
string r2 = s.str();
size_t pos2 = prompt.find_last_of("{");
prompt = prompt.replace(pos2, 7, r2);
}
}
else if(prompt.find("[f]") != std::string::npos)
{
ostringstream a;
a << fixed << setprecision(6) << arg1;
string r1 = a.str();
size_t pos = prompt.find_first_of("{");
prompt = prompt.replace(pos, 7, r1);
if(prompt.find("[c]") != std::string::npos)
{
ostringstream s;
s << fixed << setprecision(2) << arg2;
string r2 = "$" + s.str();
size_t pos2 = prompt.find_last_of("{");
prompt = prompt.replace(pos2, 7, r2);
}
else if(prompt.find("[e]") != std::string::npos)
{
ostringstream s;
s << scientific << arg2;
string r2 = s.str();
size_t pos2 = prompt.find_last_of("{");
prompt = prompt.replace(pos2, 7, r2);
}
else if(prompt.find("[f]") != std::string::npos)
{
ostringstream s;
s << fixed << setprecision(6) << arg2;
string r2 = s.str();
size_t pos2 = prompt.find_last_of("{");
prompt = prompt.replace(pos2, 7, r2);
}
else if(prompt.find("[i]") != std::string::npos)
{
ostringstream s;
s << (int)(arg2+.5);
string r2 = s.str();
size_t pos2 = prompt.find_last_of("{");
prompt = prompt.replace(pos2, 7, r2);
}
else
{
ostringstream s;
s << arg2;
string r2 = s.str();
size_t pos2 = prompt.find_last_of("{");
prompt = prompt.replace(pos2, 7, r2);
}
}
else if(prompt.find("[i]") != std::string::npos)
{
ostringstream a;
a << (int)(arg1+.5);
string r1 = a.str();
size_t pos = prompt.find_first_of("{");
prompt = prompt.replace(pos, 7, r1);
if(prompt.find("[c]") != std::string::npos)
{
ostringstream s;
s << fixed << setprecision(2) << arg2;
string r2 = "$" + s.str();
size_t pos2 = prompt.find_last_of("{");
prompt = prompt.replace(pos2, 7, r2);
}
else if(prompt.find("[e]") != std::string::npos)
{
ostringstream s;
s << scientific << arg2;
string r2 = s.str();
size_t pos2 = prompt.find_last_of("{");
prompt = prompt.replace(pos2, 7, r2);
}
else if(prompt.find("[f]") != std::string::npos)
{
ostringstream s;
s << fixed << setprecision(6) << arg2;
string r2 = s.str();
size_t pos2 = prompt.find_last_of("{");
prompt = prompt.replace(pos2, 7, r2);
}
else if(prompt.find("[i]") != std::string::npos)
{
ostringstream s;
s << (int)(arg2+.5);
string r2 = s.str();
size_t pos2 = prompt.find_last_of("{");
prompt = prompt.replace(pos2, 7, r2);
}
else
{
ostringstream s;
s << arg2;
string r2 = s.str();
size_t pos2 = prompt.find_last_of("{");
prompt = prompt.replace(pos2, 7, r2);
}
}
else
{
ostringstream a;
a << arg1;
string r1 = a.str();
size_t pos = prompt.find_first_of("{");
prompt = prompt.replace(pos, 3, r1);
if(prompt.find("[c]") != std::string::npos)
{
ostringstream s;
s << fixed << setprecision(2) << arg2;
string r2 = "$" + s.str();
size_t pos2 = prompt.find_last_of("{");
prompt = prompt.replace(pos2, 7, r2);
}
else if(prompt.find("[e]") != std::string::npos)
{
ostringstream s;
s << scientific << arg2;
string r2 = s.str();
size_t pos2 = prompt.find_last_of("{");
prompt = prompt.replace(pos2, 7, r2);
}
else if(prompt.find("[f]") != std::string::npos)
{
ostringstream s;
s << fixed << setprecision(6) << arg2;
string r2 = s.str();
size_t pos2 = prompt.find_last_of("{");
prompt = prompt.replace(pos2, 7, r2);
}
else if(prompt.find("[i]") != std::string::npos)
{
ostringstream s;
s << (int)(arg2+.5);
string r2 = s.str();
size_t pos2 = prompt.find_last_of("{");
prompt = prompt.replace(pos2, 7, r2);
}
else
{
ostringstream s;
s << arg2;
string r2 = s.str();
size_t pos2 = prompt.find_last_of("{");
prompt = prompt.replace(pos2, 7, r2);
}
}
cout << prompt << "\n";
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