#include <stdio.h>

int band1;
int band2;
int band3;
int tol;
float resistor;
int x;
int tolerance;
char colourcode [12][7]  = {{"Black \0"},
                            {"Brown \0"},
                            {"Red   \0"},
                            {"Orange\0"},
                            {"Yellow\0"},
                            {"Green \0"},
                            {"Blue  \0"},
                            {"Violet\0"},
                            {"Grey  \0"},
                            {"White \0"},
                            {"Silver\0"},
                            {"Gold  \0"}};  //multidimensional array of colour bands

int main(void)
{

	printf("\n\nResistor colour code checker, copyright 2004 by T.M.Elner\n\n");
	printf("1.  Black \n2.  Brown \n3.  Red   \n4.  Orange\n5.  Yellow \n6.  Green \n7.  Blue  \n8.  Violet\n9.  Grey  \n10. White \n11. Silver\n12. Gold  \n\n");
	printf("Please Enter the numbers corresponding to the colour\nbands seperated by a comma, enter a zero if a fourth band isn't present: \n\n");
	scanf("%d,%d,%d,%d",&band1,&band2,&band3,&tol);

	if(band1>12 || band1<1){
		printf("\n\nIncorrect Entry for Band 1, values between 1 and 12 only\n\n");
		system("pause");
		main();
	}

	if(band2>12 || band2<1){
		printf("\n\nIncorrect Entry for Band 2, values between 1 and 12 only\n\n");
		system("pause");
		main();
	}

	if(band3>12 || band3<1){
		printf("\n\nIncorrect Entry for Band 3, values between 1 and 12 only\n\n");
		system("pause");
		main();
	}

	if(tol== 0 || tol==3 || tol==11 || tol==12){}    
    else{
		printf("\n\nIncorrect Entry for Tolerance, values 0, 3, 11 and 12 only\n\n");
		system("pause");
        system("cls");
		main();
	}

	band1--;band2--;band3--; //-1 because the array of colours start at 0, but the choice numbers start at 1

	printf("\n\nYou have entered the following colour combination:\n\n");
	printf("Band 1: %s\nBand 2: %s\nBand 3: %s\nTolerance: %s\n\n",colourcode[band1],colourcode[band2],colourcode[band3],colourcode[(tol-1)]);
	band1 = (band1 * 10);
	resistor = (band1 + band2);

	if(band3 == 11){resistor = resistor/10;}
	if(band3 == 10){resistor = resistor/100;}
	if(band3<10){
		while(band3>0){
			resistor = resistor * 10;
			band3--;
		}
	}

	if(tol == 12){tolerance = 5;};
	if(tol == 11){tolerance = 10;};
	if(tol == 3){tolerance = 2;};
	if(tol == 0){tolerance = 20;};

	printf("Resistor value is: \n\n");

	if(resistor<1000){printf("%f ohms +/- %d %c\n\n",resistor, tolerance,37);}
	if(resistor>=1000 && resistor<1000000){printf("%f Kohms +/- %d %c\n\n",(resistor/1000), tolerance,37);}
	if(resistor>=1000000 && resistor<1000000000){printf("%f Mohms +/- %d %c\n\n",(resistor/1000000), tolerance,37);}


	system("pause");
	system("cls");
	main();
      return 0;
}