a) Write a C program to solve the following problem to be used from a PSoc 4 Pioneer Kit to a UART:

Taking user input for the value of the radius of a circle, calculate the area and circumference of the circle. You should store the value of pi using #define. Your program should prompt the user for the radius with a prompt such as: Please enter the radius in centimeters. After reading the user input, and performing the calculations, display the radius, and the two calculated values as follows: Radius = R cm, Area = A sq. cm, Circumference = C cm.

b) Use the template provided as a starting point:

#include

#include

#include // contains strtod(), which converts an ASCII string to a double

int main()

{

char rxbuffer[100]; // UART receive buffer

int rxindex; // UART receive buffer index

double number; // floating-point number

uint8 ch; // variable to hold received character

// initialize and clear rxbuffer

for( rxindex = 0; rxindex < 100; rxindex++ ) {

rxbuffer[rxindex] = 0u;

}

rxindex = 0; // initialize rxindex

UART_Start(); // start UART

// printf( "COM OPEN! " );

UART_UartPutString( "COM OPEN! " );// display initialization string

// printf( "Type a number: " );

UART_UartPutString( "Type a number: " );

// read string until the user presses return

// scanf( "%s", rxbuffer );

while( ch != ' ' ) {

ch = UART_UartGetChar(); // get the next character

if( ch != ' ' && ch != 0u ) { // if the character is not a return or null

rxbuffer[rxindex] = ch; // store it in the rxbuffer string

rxindex++; // increment the rxbuffer index

}

}

// output the received string to the UART

// printf( " %s ", rxbuffer );

UART_UartPutChar(' ');

UART_UartPutString(rxbuffer);

UART_UartPutChar(' ');

// convert the received string to a double (floating-point number)

number = strtod( rxbuffer, 0 );

// initialize and clear rxbuffer (good practice to avoid bugs)

for( rxindex = 0; rxindex < 100; rxindex++ ) {

rxbuffer[rxindex] = 0u;

}

rxindex = 0; // initialize rxindex

// output the float as a string and store it in rxbuffer

// NOTE: In order to properly output doubles, you must enable them in the compiler

// See http://www.cypress.com/?id=4&rID=87354 for more details

sprintf( rxbuffer, "Converted from double = %lf ", number );

// output the new string to the UART

// printf( " %s ", rxbuffer );

UART_UartPutChar(' ');

UART_UartPutString(rxbuffer);

UART_UartPutChar(' ');

return 0;

}