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   IN c++ how Converting numbers to Strings

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Instead of writing your own function convert an integer or float to a string, just use the C function snprintf (in header stdio.h) or the C++ class stringstream (in header sstream). 

In C: 

#include <math.h>
#include <stdio.h>

char* itoa(int num)
    /* log10(num) gives the number of digits; + 1 for the null terminator */
    int size = log10(num) + 1;
    char *x = malloc(size);
    snprintf(x, size, "%d", num);

In C++: 

#include <iostream>
#include <sstream>
#include <string>

string itoa(int num)
    stringstream converter;
    converter << num;
    return converter.str();