whenever i run this i always get this errors

1>c:\documents and settings\god\my documents\visual studio 2005\projects\fack\fack\fack.cpp(21) : error C2668: 'log10' : ambiguous call to overloaded function
1> c:\program files\microsoft visual studio 8\vc\include\math.h(569): could be 'long double log10(long double)'
1> c:\program files\microsoft visual studio 8\vc\include\math.h(521): or 'float log10(float)'
1> c:\program files\microsoft visual studio 8\vc\include\math.h(122): or 'double log10(double)'
1> while trying to match the argument list '(unsigned int)'
1>c:\documents and settings\god\my documents\visual studio 2005\projects\fack\fack\fack.cpp(31) : warning C4018: '<' : signed/unsigned mismatch
1>c:\documents and settings\god\my documents\visual studio 2005\projects\fack\fack\fack.cpp(40) : error C2668: 'log10' : ambiguous call to overloaded function
1> c:\program files\microsoft visual studio 8\vc\include\math.h(569): could be 'long double log10(long double)'
1> c:\program files\microsoft visual studio 8\vc\include\math.h(521): or 'float log10(float)'
1> c:\program files\microsoft visual studio 8\vc\include\math.h(122): or 'double log10(double)'
1> while trying to match the argument list '(unsigned int)'
1>c:\documents and settings\god\my documents\visual studio 2005\projects\fack\fack\fack.cpp(42) : warning C4018: '<=' : signed/unsigned mismatch

ive tried some tips, but it didnt help me...

The compiler is telling you that log10 doesn't know what to do with an int.

log10 has 3 available ways to cast an int to either a float, double, or long double, and doesn't know which one to pick. For your program, it probably doesn't really matter which one
(double is the 'default' floating point type, so double will do)

try this instead

where j is your int variable - static_cast allows it to impersonate a variable of double type.

The same applies for many other functions in the <cmath> header. (such as sqrt, sin, cos, etc)

main function needs to return 0.

#include <iostream>
#include<cmath>

using namespace std;

unsigned int d; //number of digits
unsigned char *a;
unsigned int j, n, q, z, t;
int i;
double p;

cout << "\n\tEnter the No: ";
cin >> n;

p = 0.0; //calculate the number of digits required
for(j = 2; j <= n; j++)
p += log10(j);

d = (int)p + 1;
a = (unsigned char*)malloc(d*sizeof(unsigned char));

if (!a) {
cout << "\tCould not allocate memory!!!";
exit(0);
}

for (i = 1; i < d; i++)
a[i] = 0; //initialize
a[0] = 1;
p = 0.0;

for (j = 2; j <= n; j++) {
q = 0; //initialize remainder to be 0
p += log10(j);;
z = (int)p + 1;
for (i = 0; i <= z/*NUMDIGITS*/; i++) {
t = (a[i] * j) + q;
q = (t / 10);
a[i] = (char)(t % 10);
}
}

cout << "\tThe Factorial is ";
// the fact is stored ulta..
for( i = d -1; i >= 0; i--) {
cout << (int)a[i];
}
cout << ".\n";

return 0;
}

Hope that helps! I am on a mac and the above program works in Xcode.
barnwillyb

thanks, it worked now