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9.2

binary to hexadecimal

Asked by amlegacy in C Programming Language

Hi, if have any of you can help me figure this one out, I'll be very grateful. I had to write a program to convert a binary number to base 10,8 and hex and convert  base 2, 8, 16 to a binary number. The program is executing perfectly except when I convert the binary number to hexadecimal it reads the binary number from left to right when it has to be read from right to left. In the case where there are eight digits to the binary it doesn't matter but when there are seven, six, and five it is a problem. Can any of you help me fix this without having to rewrite the entire program? I know that this isn't the most efficient way to write this problem but it was the best I could do. 
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#include <iostream>
#include <stdio.h>
#include <string.h>
 
 
 
int length_of_line ( char []);
int convert_binary (char [], int);
int convert_to_decimal(char[],int);
char convert_binary_to_hex(char [] );
int convert_to_binary(int );
 
int main ()
{	
	char line [100];//character string
	
	printf("\t1.Enter a binary number (or press 99 to enter a non-binary number)>\n", line);
	scanf("%s", &line);
	
	int n;
	
	if (!strncmp(line, "99", 2))
	{
		printf("Please enter a number to convert to binary>\n");
		scanf("%s", &line);
				
		do
		{
			printf("What is the base of the number?");
			scanf("%d", &n);	
		//	printf("%s%d%s%d\n", "base ", n, " value is ", ans);
		}
		while ( n!= 8 && n!= 10 && n!= 16);
		int ans = convert_to_decimal (line, n);
		int binary_ans = convert_to_binary (ans);
		//printf("the answer is %d", binary_ans);
 
	}
	else
	{
		do
		{
			printf("What is the base do you want to convert the binary number to?");
			scanf("%d", &n);
		}
		while ( n!= 8 && n!= 10 && n!= 16);
		int ans = 0;
		char ans_hex = NULL;
		char copy[4];
		int length = strlen(line);
 
		int endingCondition = 0;
		int i =0;
		if (n == 16) {
			printf("%s\n", "Converted to hex: ");
			while (endingCondition < length) {
				for (i=0; i<4; i++ ) {
					copy[i] = line[i+endingCondition];
				}
				ans_hex = convert_binary_to_hex (copy);//sends in four digit array
				printf("%c", ans_hex);
				endingCondition += 4;
			}
		} else {
			ans = convert_binary (line, n);
		}
		//printf("%s%d%s%d\n", copy, n, " value is ", ans);
	}
}
 
//function to convert base 8, 10, and 16 to decimal
int convert_to_decimal (char value [], int n) {
 
	int length = strlen(value);
	int power = 1;
	int sum = 0;
	int i=0;
	
	
	if (n == 8) {
		int charValue=0;
		for (i=length-1; i>=0; --i)//start at end of string
		{
		//if value[i] is not a 1 or 0 then its not a valid binary number
			if (value[i] < 48 ||value[i] > 54) {
				printf("%s\n", "invalid octal input now exiting");
				exit(1);
			}
			//convert the ascii value of the character to decimal so we can evaluate it
			charValue = value[i] -48;
			if (charValue != 0) {
				sum = sum + ( charValue * power);
			} 
			power = power * 8;
		}	
		return sum;
	}
	
	
	else if (n == 10) {
		
	int charValue=0;
		for (i=length-1; i>=0; --i)//start at end of string
		{
		//if value[i] is not a 1 or 0 then its not a valid binary number
			if (value[i] < 48 ||value[i] > 57) {
				printf("%s\n", "invalid decimal input now exiting");
				exit(1);
			}
			//convert the ascii value of the character to decimal so we can evaluate it
			charValue = value[i] -48;
			if (charValue != 0) {
				sum = sum + ( charValue * power);
			} 
			power = power * 10;
		}	
		return sum;
	}
	
	else {
	
		int charValue=0;
		for (i=length-1; i>=0; --i)//start at end of string
		{
		//if value[i] is not a 1 or 0 then its not a valid binary number
			if (!(value[i] >= 48 && value[i] <= 57) && !(value[i] >= 65 && value[i] <= 70) && !(value[i] >= 97 && value[i] <= 102)){
				printf("%s\n", "invalid hex input now exiting");
				exit(1);
			}
			//convert the ascii value of the character to decimal so we can evaluate it
			if (value[i] >= 48 && value[i] <= 57)
			{
				charValue = value[i] -48;
				
			}
			
			else if (value[i] >= 65 && value[i] <= 70)
			
			{
				charValue = value[i] -55;
				
			}
			
			else 
			
			{
			
				charValue = value[i] -87;
				
			}
				
			if (charValue != 0) {
				sum = sum + ( charValue * power);
			} 
			power = power * 16;
		}	
		return sum;
	
	
	}
 
}
 
//function to convert decimal number to binary
int convert_to_binary(int m)
 
{
	int rem;
	int store [100];
	int i = 0;
	int j;
	
	do
	{
		rem = m%2;
		m = m/2;
		store[i] = rem;
		++i;
 
	}
	while (m!=0);
	
	
	for (j=(i-1); j>=0; --j){
	
		printf("%d", store[j]);
	
	}
	
}	
 
//function to convert binary number to base 8 and base 10
int convert_binary (char value [], int n)
{
	int length = strlen(value);
	int power = 1;
	int sum = 0;
	int i=0;
	int hold=0;
	int ten = 1;
	
	if (n == 8)
	{
		int charValue=0;
		int count=0;
		for (i=length-1; i>=0; --i)
		{
			
			//if value[i] is not a 1 or 0 then its not a valid binary number
			if (value[i] != 48 && value[i] != 49) {
				printf("%s\n", "invalid binary input now exiting");
				exit(1);
			}
			//convert the ascii value of the character to decimal so we can evaluate it
			charValue = value[i] -48;
			if (charValue != 0) {
				sum = sum + ( charValue * power);
			} 
			power = power * 2;
			
			++count;
			if (count == 3)
			{
				count = 0;
				hold = hold + (sum * ten);
				ten = ten * 10;
				sum = 0;
				power = 1;
				
			}
		}
		hold = hold+(ten*sum);
		return hold;
	}
	
	
	else if (n == 10)
	{
		int charValue=0;
		for (i=length-1; i>=0; --i)
		{
		//if value[i] is not a 1 or 0 then its not a valid binary number
			if (value[i] != 48 && value[i] != 49) {
				printf("%s\n", "invalid binary input now exiting");
				exit(1);
			}
			//convert the ascii value of the character to decimal so we can evaluate it
			charValue = value[i] -48;
			if (charValue != 0) {
				sum = sum + ( charValue * power);
			} 
			power = power * 2;
		}	
		return sum;
	}
	return 1;
}
 
 
//Function to convert binary number to hexadeciaml
char convert_binary_to_hex(char line[]) {
	int count =0;
	int length = strlen(line);
	for (int i = 0; i < 4; i++ ) {
			if (line[i] == 48 || line[i] == 49 ) {
				count++;
			}
	}
	switch (count){
		case 4:
			if (!strncmp(line, "0000", 4)){
					return '0';
			}else if (!strncmp(line, "0001", 4)) {
					return '1';
			}else if (!strncmp(line, "0010", 4)) {
					return '2';
			}else if (!strncmp(line, "0011", 4)) {
					return '3';
			}else if (!strncmp(line, "0100", 4)) {
					return '4';
			}else if (!strncmp(line, "0101", 4)) {
					return '5';
			}else if (!strncmp(line, "0110", 4)) {
					return '6';
			}else if (!strncmp(line, "0111", 4)) {
					return '7';
			}else if (!strncmp(line, "1000", 4)) {
					return '8';
			}else if (!strncmp(line, "1001", 4)) {
					return '9';
			}else if (!strncmp(line, "1010", 4)) {
					return 'A';
			}else if (!strncmp(line, "1011", 4)) {
					return 'B';
			}else if (!strncmp(line, "1100", 4)) {
					return 'C';
			}else if (!strncmp(line, "1101", 4)) {
					return 'D';
			}else if (!strncmp(line, "1110", 4)) {
					return 'E';
			}else if (!strncmp(line, "1111", 4)) {
					return 'F';
			}			
			break;
		case 3:
			if (!strncmp(line, "000", 3)){
					return '0';
			} else if (!strncmp(line,"001", 3)) {
					return '1';
			}else if (!strncmp(line, "010", 3)) {
					return '2';
			}else if (!strncmp(line, "011", 3)) {
					return '3';
			}else if (!strncmp(line, "100", 3)) {
					return '4';
			}else if (!strncmp(line, "101", 3)) {
					return '5';
			}else if (!strncmp(line, "110", 3)) {
					return '6';
			}else if (!strncmp(line, "111", 3)) {
					return '7';
			}
			break;
		case 2:
			if (!strncmp(line, "00", 2)){
					return '0';
			} else if (!strncmp(line, "01", 2)) {
					return '1';
			}else if (!strncmp(line, "10", 2)) {
					return '2';
			}else if (!strncmp(line, "11", 2)) {
					return '3';
			}
			break;
		case 1:
			if (!strncmp(line, "0", 1)){
					return '0';
			} else if (!strncmp(line, "1", 1)) {
					return '1';
			}
			break;
		default:
			printf("Error\n");
			break;
		
		}
			
		
 
}
 
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[+][-]04/27/08 11:58 AM, ID: 21450012Expert Comment

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