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subtraction.c
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subtraction.c
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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
/********* DEFINED CONSTANTS *********/
#define MAX 32
/********* FUNCTION DECLARATION *********/
void menu(int format[]);
void reverse(char *str);
void onecom(char *bi1, char *bi2, int format[], int len1, int len2, int sum[]);
void twocom(int sum[], int len, int format[]);
/********* MAIN STARTS HERE *********/
int main(void)
{
int len1, len2;
int format[MAX], sum[MAX];
char bi1[MAX], bi2[MAX];
menu(format);
printf("Enter the first binary value:- ");
scanf("%s", bi1);
printf("Enter the second binary value:- ");
scanf("%s", bi2);
len1 = strlen(bi1);
len2 = strlen(bi2);
if (strlen(bi1) != strlen(bi2))
{
printf("The binary values should contain equal no. of digits.\n");
exit(1);
}
else if (len1 > 32 || len2 > 32 )
{
printf("The no. of digits of the binary values should be <= 32.\n");
exit(2);
}
onecom(bi1, bi2, format, len1, len2, sum);
twocom(sum, len1, format);
exit(0);
}
/********* FUNCTION DEFINITION *********/
void menu(int format[])
{
int opt;
printf("In which type of notation should I take the first binary value?\n");
printf(" 1) Big Endian\n");
printf(" 2) Little Endian\n");
printf("Your option please: ");
scanf("%d", &opt);
if (opt < 1 || opt > 2)
{
printf("Select the options which are given above\n");
exit(1);
}
format[0] = opt;
printf("In which type of notation should I take the second binary value?\n");
printf(" 1) Big Endian\n");
printf(" 2) Little Endian\n");
printf("Your option please: ");
scanf("%d", &opt);
if (opt < 1 || opt > 2)
{
printf("Select the options which are given above\n");
exit(1);
}
format[1] = opt;
printf("In which type of notation should I represent the sum?\n");
printf(" 1) Big Endian\n");
printf(" 2) Little Endian\n");
printf("Your option please: ");
scanf("%d", &opt);
if (opt < 1 || opt > 2)
{
printf("Select the options which are given above\n");
exit(1);
}
format[2] = opt;
system("clear");
return ;
}
void onecom(char *bi1, char *bi2, int format[], int len1, int len2, int sum[])
{
int i = 0, x1, x2, carry = 0, num;
if (format[0] == 2)
{
reverse(bi1);
}
if (format[1] == 2)
{
reverse(bi2);
}
while ((*bi1 != '\0' && *bi2 != '\0'))
{
x1 = (int)(*bi1 - '0');
x2 = 1 - (int)(*bi2 - '0');
num = 0;
num = (((num | (x1 << 2)) | (x2 << 1)) | carry);
switch (num)
{
case 1:
sum[i] = 1;
carry = 0;
break;
case 2:
sum[i] = 1;
carry = 0;
break;
case 3:
sum[i] = 0;
carry = 1;
break;
case 4:
sum[i] = 1;
carry = 0;
break;
case 5:
sum[i] = 0;
carry = 1;
break;
case 6:
sum[i] = 0;
carry = 1;
break;
case 7:
sum[i] = 1;
carry = 1;
break;
case 0:
sum[i] = 0;
carry = 0;
break;
default:
printf("Given strings are not in binary.\n");
exit(2);
}
i++;
bi1++;
bi2++;
printf("$%d$\n", sum[i-1]);
}
return ;
}
void twocom(int sum[], int len, int format[])
{
int i = 0, x1, x2, carry = 0, num, j;
int one[MAX], diff[MAX];
one[i] = 1;
for (i = 1; i < len; i++)
{
one[i] = 0;
}
i = 0;
while (i < len)
{
x1 = sum[i];
x2 = one[i];
printf("%d %d %d\n", x1, x2, carry);
num = 0;
num = (((num | (x1 << 2)) | (x2 << 1)) | carry);
switch (num)
{
case 1:
diff[i] = 1;
carry = 0;
break;
case 2:
diff[i] = 1;
carry = 0;
break;
case 3:
diff[i] = 0;
carry = 1;
break;
case 4:
diff[i] = 1;
carry = 0;
break;
case 5:
diff[i] = 0;
carry = 1;
break;
case 6:
diff[i] = 0;
carry = 1;
break;
case 7:
diff[i] = 1;
carry = 1;
break;
case 0:
diff[i] = 0;
carry = 0;
break;
}
i++;
}
if (format[2] == 1)
{
if (carry == 1)
{
printf("1");
}
for (j = 0; j < i; j++)
{
printf("%d", diff[j]);
}
printf(" is the resultant string in BIG ENDIAN Notation.\n");
}
else if (format[2] == 2)
{
if (carry == 1)
{
diff[i] = 1;
}
for (j = i; j >= 0; j--)
{
printf("%d", diff[j]);
}
printf(" is the resultant string in LITTLE ENDIAN Notation.\n");
}
return ;
}
void reverse(char *str)
{
int c, i, j;
for (i = 0, j = strlen(str) - 1; i < j; i++, j--)
{
c = str[i];
str[i] = str[j];
str[j] = c;
}
return ;
}