substractor.c
1.05 KB
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#include <stdio.h>
#include <string.h>
#include "auxiliar.h"
int check_length(char **inputs, uint8_t num_inputs)
{
int input_length = strlen(inputs[0]);
if((input_length != strlen(inputs[1])) || (strlen(inputs[2]) != 1))
{
return -1;
}
return input_length;
}
int main(int argc, char **argv)
{
int i;
int pos;
if(argc != 2)
{
error();
}
char *input = argv[1];
if(!strcmp(input,"error"))
{
error();
}
char **inputs = comma_separate(input);
if(inputs == NULL)
{
error();
}
int num_inputs = num_occurrences(input,',');
if(num_inputs != 3)
{
error();
}
int input_length = check_length(inputs,num_inputs);
if(input_length == -1)
{
error();
}
int a,b,borrow_in,c;
char borrow_out = '0';
a = bin2dec(inputs[0]);
b = bin2dec(inputs[1]);
borrow_in = bin2dec(inputs[2]);
c = a-(b+borrow_in);
if(c < 0)
{
borrow_out = '1';
}
char *result = dec2bin(c,input_length);
printf("%s,%c",result,borrow_out);
free(result);
free_mem(inputs,num_inputs);
return 0;
}