File content as of revision 1:59178970c02b:

#include "mbed.h"
#include <string.h>

DigitalOut led1(D11);
DigitalOut led2(D3);
DigitalOut led3(D4);
DigitalOut led4(D5);
DigitalOut led5(D6);
DigitalOut led6(D7);
DigitalOut led7(D9);
DigitalOut led8(D10);
DigitalOut led[8] = {led1,led2,led3,led4,led5,led6,led7,led8};
AnalogIn analog_value(A0);
 
//------------------------------------
 
//------------------------------------
 
Serial pc(D8, D2); //D8 = Tx, D2 = Rx 
int funcA(){
    uint8_t a=0;
    uint8_t b=0;
    char input[2]={0,0};
    
        input[0] = pc.getc();
        input[1] = pc.getc();
        a = input[0]-'0';
        b = input[1]-'0';
        if(a>=9||a<0) a = 0;
        if(b>=9||b<0) b = 0;
        
        switch(a){
            case 0: led5 = 0; led6 = 0; led7 = 0; led8 = 0; break;
            case 1: led5 = 1; led6 = 0; led7 = 0; led8 = 0; break;
            case 2: led5 = 0; led6 = 1; led7 = 0; led8 = 0; break;
            case 3: led5 = 1; led6 = 1; led7 = 0; led8 = 0; break;
            case 4: led5 = 0; led6 = 0; led7 = 1; led8 = 0; break;
            case 5: led5 = 1; led6 = 0; led7 = 1; led8 = 0; break;
            case 6: led5 = 0; led6 = 1; led7 = 1; led8 = 0; break;
            case 7: led5 = 1; led6 = 1; led7 = 1; led8 = 0; break;
            case 8: led5 = 0; led6 = 0; led7 = 0; led8 = 1; break;
            case 9: led5 = 1; led6 = 0; led7 = 0; led8 = 1; break;
        }
        switch(b){
            case 0: led1 = 0; led2 = 0; led3 = 0; led4 = 0; break;
            case 1: led1 = 1; led2 = 0; led3 = 0; led4 = 0; break;
            case 2: led1 = 0; led2 = 1; led3 = 0; led4 = 0; break;
            case 3: led1 = 1; led2 = 1; led3 = 0; led4 = 0; break;
            case 4: led1 = 0; led2 = 0; led3 = 1; led4 = 0; break;
            case 5: led1 = 1; led2 = 0; led3 = 1; led4 = 0; break;
            case 6: led1 = 0; led2 = 1; led3 = 1; led4 = 0; break;
            case 7: led1 = 1; led2 = 1; led3 = 1; led4 = 0; break;
            case 8: led1 = 0; led2 = 0; led3 = 0; led4 = 1; break;
            case 9: led1 = 1; led2 = 0; led3 = 0; led4 = 1; break;
        }
    return 0;
}
int funcB(){
    float meas;
    meas = analog_value.read(); // Converts and read the analog input value (value from 0.0 to 1.0)
    meas = meas * 3.3; // Change the value to be in the 0 to 33 range
    pc.printf("%f\n",meas); 
    return 0;
}
int main(){
    char input = 'x';
    
    while(1){
        pc.printf("mode a : input 2 digits number.\r\n");
        pc.printf("mode b : read analog from VR.\r\n\r\n");
        pc.printf("input : ");
        input = pc.getc();
        switch(input){
            case 'a': pc.printf("mode a:\r\n");funcA();break;
            case 'b': pc.printf("mode b:\r\n");funcB();break;
        }
        
        pc.printf("\r\n**************************\r\n\r\n");
    }
 
}