C/C++ :: Writing Int Value To UART?

I'm working on a 10 week project, and this is a small issue that I can't fix myself.

///////////////////////////////////////////
/* WRITE SINGLE CHAR */
///////////////////////////////////////////
void LCD_Write(unsigned char c) {
while(!(UCSR1A & (1<<UDRE1))); // 0x20 (1<<UDRE0)
UDR1 = c;
Delay(5);

[code]....

This project is a Atmega 2560 connected to a serial GLCD screen.I've got serial communication working perfectly.Now as you can see I wrote a function that sends 1 single character to the UDR1.I wrote a function that uses this first function for sending entire words (strings).All of this works great.

Next challenge is writing a "int byte" to the GLCD screen.In this case the variable "voltage" has a value of 100.I'd like to write that 100 to the serial display via the uart.But whenever I do this the screen reads this 100 as a ascii decimal number... (= d)

I've tried things like

LCD_PrintStr("voltage"); (Result: The word voltage shows up on the screen)
LCD_Write(voltage); (Result: write ascii letter for dec 100 (= d ))

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