Andrea Longobardi / Mbed 2 deprecated Serial_Integer_Calculator

This simple program enable LPC11U24 MBED board to act as a simple integer calculator. Just type the operation you want to execute from the serial terminal. Admitted operations: +, -, * /, ^ (only positive exponent). Multiple operations in raw are supported as well as negative integer.

Dependencies:   mbed

Fork of Serial_HelloWorld_Mbed by mbed official

main.cpp@3:3bef1c4e42d4, 2014-09-22 (annotated)

Committer:
andrelongo85
Date:
Mon Sep 22 06:23:35 2014 +0000
Revision:
3:3bef1c4e42d4
Parent:
2:0baf535ed8f8
Child:
4:235e50314809
Interrupt driven and added support to power operator (only positive exponent)

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 0:879aa9d0247b 1 #include "mbed.h"
andrelongo85 1:247161a5c5d6 2
andrelongo85 1:247161a5c5d6 3 #define FALSE 0
andrelongo85 1:247161a5c5d6 4 #define TRUE 1
andrelongo85 1:247161a5c5d6 5
mbed_official 0:879aa9d0247b 6 Serial pc(USBTX, USBRX); // tx, rx
andrelongo85 1:247161a5c5d6 7
andrelongo85 1:247161a5c5d6 8 // function to convert a char buffer to decimal inetger
andrelongo85 1:247161a5c5d6 9 int char_to_int (const char *char_p, const int size)
andrelongo85 1:247161a5c5d6 10 {
andrelongo85 1:247161a5c5d6 11 int tmp = 0;
andrelongo85 1:247161a5c5d6 12 int pot_ten=1;
andrelongo85 1:247161a5c5d6 13 for ( int i= (size -1); i >= 0 ; i-- ) {
andrelongo85 1:247161a5c5d6 14 tmp = int( tmp + ( ( int(char_p[i]) - 48 ) * pot_ten ));
andrelongo85 1:247161a5c5d6 15 pot_ten*=10;
andrelongo85 1:247161a5c5d6 16 //pc.printf("\n");
andrelongo85 1:247161a5c5d6 17 //print_num(tmp);
andrelongo85 1:247161a5c5d6 18 //pc.printf("\n");
andrelongo85 1:247161a5c5d6 19 //print_num(pot_ten);
andrelongo85 1:247161a5c5d6 20 }
andrelongo85 1:247161a5c5d6 21 return tmp;
andrelongo85 1:247161a5c5d6 22 }
andrelongo85 1:247161a5c5d6 23
andrelongo85 1:247161a5c5d6 24
andrelongo85 1:247161a5c5d6 25 // check if the input is valid
andrelongo85 1:247161a5c5d6 26 bool si_check_valid(const char & input)
andrelongo85 1:247161a5c5d6 27 {
andrelongo85 3:3bef1c4e42d4 28 if ( ( ( int(input) > 57) || ( int(input) < 48) ) && (input != '+') && (input != '-') && (input != '*') && (input != '/') && (input != '^') && (input != '=') ) {
andrelongo85 1:247161a5c5d6 29 return FALSE;
andrelongo85 1:247161a5c5d6 30 } else {
andrelongo85 1:247161a5c5d6 31 return TRUE;
andrelongo85 1:247161a5c5d6 32 }
andrelongo85 1:247161a5c5d6 33 }
andrelongo85 1:247161a5c5d6 34
andrelongo85 1:247161a5c5d6 35 //check if the input is a number
andrelongo85 1:247161a5c5d6 36 bool si_check_number(const char & input)
andrelongo85 1:247161a5c5d6 37 {
andrelongo85 1:247161a5c5d6 38 if ( (int(input) >= 48) && ( int(input) <= 57) ) {
andrelongo85 1:247161a5c5d6 39 return TRUE;
andrelongo85 1:247161a5c5d6 40 } else {
andrelongo85 1:247161a5c5d6 41 return FALSE;
andrelongo85 1:247161a5c5d6 42 }
andrelongo85 1:247161a5c5d6 43 }
andrelongo85 1:247161a5c5d6 44
andrelongo85 3:3bef1c4e42d4 45 char c;
andrelongo85 3:3bef1c4e42d4 46 char op = '=';
andrelongo85 3:3bef1c4e42d4 47 char operand [100];
andrelongo85 3:3bef1c4e42d4 48 char buf[10];
andrelongo85 3:3bef1c4e42d4 49 int result =0;
andrelongo85 3:3bef1c4e42d4 50 int result_copy=0;
andrelongo85 3:3bef1c4e42d4 51 int index = 0;
andrelongo85 3:3bef1c4e42d4 52 int ioperand =0;
andrelongo85 3:3bef1c4e42d4 53 bool first = TRUE;
andrelongo85 3:3bef1c4e42d4 54 bool sign_check = TRUE;
andrelongo85 3:3bef1c4e42d4 55 bool neg_operand = FALSE;
andrelongo85 3:3bef1c4e42d4 56 bool error=FALSE;
andrelongo85 2:0baf535ed8f8 57
andrelongo85 1:247161a5c5d6 58
andrelongo85 3:3bef1c4e42d4 59 // serial interrup callback function
andrelongo85 3:3bef1c4e42d4 60 void callback()
andrelongo85 1:247161a5c5d6 61 {
mbed_official 0:879aa9d0247b 62 while(1) {
andrelongo85 2:0baf535ed8f8 63
andrelongo85 1:247161a5c5d6 64 c=pc.getc(); //get serial input
andrelongo85 1:247161a5c5d6 65
andrelongo85 1:247161a5c5d6 66 if (!si_check_valid(c)) { // Invalid Input
andrelongo85 1:247161a5c5d6 67 pc.putc(c);
andrelongo85 1:247161a5c5d6 68 printf ("Invalid Input!\n");
andrelongo85 1:247161a5c5d6 69 } else if (si_check_number(c)) { // Operand has been entered
andrelongo85 1:247161a5c5d6 70 pc.putc(c);
andrelongo85 1:247161a5c5d6 71 operand[index] = c;
andrelongo85 1:247161a5c5d6 72 index++;
andrelongo85 2:0baf535ed8f8 73 sign_check = FALSE; //sign check disactivated
andrelongo85 1:247161a5c5d6 74 } else { //Operator has been entered
andrelongo85 2:0baf535ed8f8 75
andrelongo85 2:0baf535ed8f8 76 if(!sign_check) {
andrelongo85 2:0baf535ed8f8 77 pc.putc('\n');
andrelongo85 2:0baf535ed8f8 78 pc.putc(c);
andrelongo85 2:0baf535ed8f8 79 pc.putc('\n');
andrelongo85 1:247161a5c5d6 80
andrelongo85 2:0baf535ed8f8 81 // sign adjustment
andrelongo85 2:0baf535ed8f8 82 if(neg_operand) {
andrelongo85 2:0baf535ed8f8 83 ioperand = -(char_to_int(operand,index));
andrelongo85 2:0baf535ed8f8 84 } else {
andrelongo85 2:0baf535ed8f8 85 ioperand = char_to_int(operand,index);
andrelongo85 2:0baf535ed8f8 86 }
andrelongo85 3:3bef1c4e42d4 87
andrelongo85 3:3bef1c4e42d4 88
andrelongo85 2:0baf535ed8f8 89 if (first) { //First Operator
andrelongo85 2:0baf535ed8f8 90 result = ioperand;
andrelongo85 2:0baf535ed8f8 91 first = FALSE;
andrelongo85 2:0baf535ed8f8 92 } else { //Do Calculation
andrelongo85 1:247161a5c5d6 93
andrelongo85 2:0baf535ed8f8 94 if(op == '+') {
andrelongo85 2:0baf535ed8f8 95 result = int (result + ioperand);
andrelongo85 2:0baf535ed8f8 96 } else if (op == '-') {
andrelongo85 2:0baf535ed8f8 97 result = int (result - ioperand);
andrelongo85 2:0baf535ed8f8 98 } else if (op == '/') {
andrelongo85 2:0baf535ed8f8 99 result = int (result / ioperand);
andrelongo85 2:0baf535ed8f8 100 } else if (op == '*') {
andrelongo85 2:0baf535ed8f8 101 result = int (result * ioperand);
andrelongo85 3:3bef1c4e42d4 102 } else if (op == '^') {
andrelongo85 3:3bef1c4e42d4 103 if(!neg_operand) {
andrelongo85 3:3bef1c4e42d4 104 result_copy = result;
andrelongo85 3:3bef1c4e42d4 105 for(int i = (abs(ioperand) -1); i>0; i--) {
andrelongo85 3:3bef1c4e42d4 106 result *=result_copy;
andrelongo85 3:3bef1c4e42d4 107 }
andrelongo85 3:3bef1c4e42d4 108 } else {
andrelongo85 3:3bef1c4e42d4 109 pc.printf("ERROR:Negative exponent");
andrelongo85 3:3bef1c4e42d4 110 error = TRUE;
andrelongo85 3:3bef1c4e42d4 111 }
andrelongo85 2:0baf535ed8f8 112 }
andrelongo85 2:0baf535ed8f8 113
andrelongo85 2:0baf535ed8f8 114 if (c == '=') { // Operator = has been entered--> Print result and reset calculator
andrelongo85 2:0baf535ed8f8 115 for (int j =9; j>=0; j--) {
andrelongo85 2:0baf535ed8f8 116 buf[j]='\0';
andrelongo85 2:0baf535ed8f8 117 }
andrelongo85 3:3bef1c4e42d4 118 if(!error) {
andrelongo85 3:3bef1c4e42d4 119 sprintf(buf, "%d", result);
andrelongo85 3:3bef1c4e42d4 120 pc.printf("%s", buf);
andrelongo85 3:3bef1c4e42d4 121 }
andrelongo85 2:0baf535ed8f8 122 pc.printf("\n\n");
andrelongo85 2:0baf535ed8f8 123 pc.printf("Please enter a new operation\n");
andrelongo85 2:0baf535ed8f8 124 first = TRUE;
andrelongo85 3:3bef1c4e42d4 125 error = FALSE;
andrelongo85 2:0baf535ed8f8 126 }
andrelongo85 1:247161a5c5d6 127 }
andrelongo85 2:0baf535ed8f8 128 op = c; // assign the Operator
andrelongo85 2:0baf535ed8f8 129 index=0; // reset the operand
andrelongo85 2:0baf535ed8f8 130 sign_check = TRUE; // sign check activated
andrelongo85 3:3bef1c4e42d4 131 neg_operand=FALSE;
andrelongo85 2:0baf535ed8f8 132 } else {
andrelongo85 2:0baf535ed8f8 133 pc.putc(c);
andrelongo85 2:0baf535ed8f8 134 if (c=='-') {
andrelongo85 2:0baf535ed8f8 135 neg_operand=TRUE;
andrelongo85 2:0baf535ed8f8 136 sign_check = FALSE;
andrelongo85 2:0baf535ed8f8 137 } else if (c=='+') {
andrelongo85 2:0baf535ed8f8 138 neg_operand=FALSE;
andrelongo85 2:0baf535ed8f8 139 sign_check = FALSE;
andrelongo85 3:3bef1c4e42d4 140 } else {
andrelongo85 3:3bef1c4e42d4 141 pc.printf("ERROR:Two consecutive Operators entered");
andrelongo85 3:3bef1c4e42d4 142 error = TRUE;
andrelongo85 1:247161a5c5d6 143 }
andrelongo85 1:247161a5c5d6 144 }
andrelongo85 1:247161a5c5d6 145 }
mbed_official 0:879aa9d0247b 146 }
andrelongo85 1:247161a5c5d6 147 }
andrelongo85 1:247161a5c5d6 148
andrelongo85 3:3bef1c4e42d4 149 int main()
andrelongo85 3:3bef1c4e42d4 150 {
andrelongo85 3:3bef1c4e42d4 151 pc.attach(&callback,Serial::RxIrq);
andrelongo85 3:3bef1c4e42d4 152
andrelongo85 3:3bef1c4e42d4 153 pc.printf("LPC Integer Calculator!\n");
andrelongo85 3:3bef1c4e42d4 154 while (1) {}
andrelongo85 3:3bef1c4e42d4 155 }