In while(1) loop, for receiving data we used UARTCharsAvail() function. but here without without typing any character in terminal window it keep on showing unknown charater. how to display the exact character that is in RX FIFO

#include<stdint.h>
#include<stdbool.h>
#include<hw_types.h>
#include<hw_memmap.h>
#include<sysctl.h>
#include<gpio.h>
#include<uart.h>
#include<tm4c123gh6pm.h>
#include<interrupt.h>
#define RS GPIO_PIN_1
#define RW GPIO_PIN_3
#define EN GPIO_PIN_2

void dly(unsigned int ms)
{
ms=(SysCtlClockGet()/3.0)*ms/1000;
SysCtlDelay(ms);
}

void lcd(unsigned char a, unsigned char b)
{
GPIOPinWrite(GPIO_PORTE_BASE, RS, a);
GPIOPinWrite(GPIO_PORTE_BASE, RW, 0);
GPIOPinWrite(GPIO_PORTB_BASE, 0xFF, b);
GPIOPinWrite(GPIO_PORTE_BASE, EN, 4);dly(2);
GPIOPinWrite(GPIO_PORTE_BASE, EN, 0);
}

void lcd_init()
{
lcd(0, 0x38);
lcd(0, 0x0E);
lcd(0, 0x01);
}

void main()
{
SysCtlClockSet(SYSCTL_SYSDIV_5| SYSCTL_USE_PLL| SYSCTL_OSC_MAIN| SYSCTL_XTAL_16MHZ);
SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOB);
GPIOPinTypeGPIOOutput(GPIO_PORTB_BASE, 0xFF);
SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOE);
GPIOPinTypeGPIOOutput(GPIO_PORTE_BASE, 0xFF);
SysCtlPeripheralReset(SYSCTL_PERIPH_UART3);//reset
SysCtlPeripheralEnable(SYSCTL_PERIPH_UART3);
SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOC);

GPIOPinConfigure(0x00021801);//RX
GPIOPinConfigure(0x00021C01);//TX
GPIOPinTypeUART(GPIO_PORTC_BASE, GPIO_PIN_6|GPIO_PIN_7);
UARTFIFODisable(UART3_BASE);
UARTClockSourceSet(UART3_BASE,UART_CLOCK_SYSTEM);
UARTConfigSetExpClk(UART3_BASE, SysCtlClockGet(), 115200,(UART_CONFIG_WLEN_8 | UART_CONFIG_STOP_ONE |UART_CONFIG_PAR_NONE));
UARTEnable(UART3_BASE);
lcd_init(); dly(100);
UARTFIFOEnable(UART3_BASE);
UARTCharPut(UART3_BASE, 'E');

while(1)
{
if(UARTCharsAvail(UART3_BASE)) {lcd(0,0xC0); char a=UARTCharGet(UART3_BASE); dly(10); lcd(2,a);}

//else if(!UARTCharsAvail(UART3_BASE)) {lcd(0,0x80); lcd(2,'Y');}// without receiving a single character it returns true and execute if condition
//lcd(2,UARTCharGet(UART3_BASE));
}
}

here i have attached my output .