Conversion of floating point decimal into other base system

DEC_TO_ALL.CPP

#include<iostream>
using namespace std;
void convert(float num,float base)
{
    int a[30];
    int num1,k;
    num1=num;
    num=num-num1;
    int t;
    a[0]=num1%(int)base;
    num1=num1/(int)base;
    int i=1;
    int c=0;
    while(num1>=1)
    {
        a[i]=num1%(int)base;
        num1=num1/(int)base;
        i++;
        c++;
    }
    for(int j=c;j>=0;j--)
    {
        if(a[j]>9){a[j]=a[j]+55;cout<<(char)a[j];}
        else{cout<<a[j];}
    }
    int b[20];
    i=0;
    float temp;
    do
    {
        temp=(num*base);
        b[i]=(int)temp;
        num=temp-b[i];
        i++;
       // cout<<"\nvalues after multi  "<<temp<<endl;
        if(temp==1){k=i;break;}
        else{k=7;}
    }while(i<20);
    cout<<".";
    for(int j=0;j<k-1;j++)
    {
        if(b[j]>9){b[j]=b[j]+55;cout<<(char)b[j];}
        else{cout<<b[j];}
    }
}
int main()
{
    float num;
    float base;
    char ch;
    do
    {
        cout<<"Enter the decimal number :";
        cin>>num;
        cout<<"\nEnter the base system you want to convert: ";
        cin>>base;
        convert(num,base);
        cout<<"\nTo do the process again press y"<<endl;
        cin>>ch;
    }while(ch=='y');
    return 0;
}