iam interfacing 1306 oled display to lpc1768 but not working

https://github.com/ExploreEmbedded/Explore-Cortex-M3-LPC1768-DVB-14001/blob/master/Code/KeilExamples/00-libfiles/oled_i2c.c 

oled library

main 

main()
{
//init_OLED();
SystemInit();
i2c0Init();
// OLED_Init();
OLED_Init(P0_19, P0_20);

// OLED_SetFont(SmallFont);
//OLED_SetFont(2);

while(1)
{
//OLED_SetFont(MediumNumbers);
for(i=0;i<1000;i++)
{

OLED_PrintFloatNumber(i/3.0,3,50,0);
OLED_Update();
// delay_ms(1000);
}
}
}

please help i want to print a dtring on oled