#include <stdio.h>
 
int main ()
{
    int var1=1048575;
    int var2=1048575;
 
    char buffer [100];
    char zeros [17] = {'0'};
 
    sprintf (buffer, "%x%x", var1, var2);
 
    // Put the zeros in front
    int len = strlen(buffer);
    if (len < 16)
    {
        zeros[16-len] = 0x0; // Terminate the string at 16-len
    }
    else
    {
        zeros[0] = 0x0;  // Terminate the string at 0 as no extra zero is needed
    }
 
    printf("%s%s\n", zeros, buffer);
 
    return 0;
}

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