Answer / sabarish

for decimal to hexa its very simple.

void main()
{
int a=10;

printf("%x",a); // returns the hexa decimal equivalent
}

Answer / sabarish

code to convert binary to decimal

void dec2bin(long decimal, char *binary)
{
int k = 0, n = 0;
int neg_flag = 0;
int remain;
int old_decimal; // for test
char temp[80];

// take care of negative input
if (decimal < 0)
{
decimal = -decimal;
neg_flag = 1;
}
do
{
old_decimal = decimal; // for test
remain = decimal % 2;
// whittle down the decimal number
decimal = decimal / 2;
// this is a test to show the action
printf("%d/2 = %d remainder = %d\n", old_decimal,
decimal, remain);
// converts digit 0 or 1 to character '0' or '1'
temp[k++] = remain + '0';
} while (decimal > 0);

if (neg_flag)
temp[k++] = '-'; // add - sign
else
temp[k++] = ' '; // space

// reverse the spelling
while (k >= 0)
binary[n++] = temp[--k];

binary[n-1] = 0; // end with NULL
}

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