Adding decimal numbers as strings in C - c

Question

So I understand how to perform calculations on integers represented in strings and then printing the result in a string. But I'm lost on how to do the same thing with a decimal in the number represented in a string.
Here's how I did it with integers. This part of the code is adding together two integers:
int answer = 0;
char str1[100];
int count = 0;
int total = 0;
int k = 0;
int diff = 0;
if (ele == ele2) {
for (k = strlen(op1) - 1; k > -1; k--) {
if ((strspn(operand, "+") == strlen(operand))) {
answer = (op1[k] - '0') + (op2[k] - '0');
} else if ((strspn(operand, "-") == strlen(operand))) {
answer = (op1[k] - '0') - (op2[k] - '0');
}
total += (pow(10, count) * answer);
count++;
}
sprintf(str1, "%d", total);
printf("Answer: %s ", str1);
}
Output
// 12 + 14
Answer: 26 // Answer given as a string
Example
12.2 + 14.5 // Three strings
Answer: 16.7 // Answer as string
Current Attempt:
for (k = strlen(argv[1]) - 1; k > -1; k--) {
if (argv[1][k] == '.') {
dec = k;
} else {
answer = (argv[1][k] - '0') + (argv[3][k] - '0');
total += (pow(10, count) * answer);
count++;
}
}
// needs to be converted to a long?
// ele is the length of the operand
total = total / pow(10, ele - dec);
sprintf(str1, "%d", total);
printf("Answer: %s ", str1);

Answer 1

Sharing a simple algo to begin with (and assuming your adding integer funciton works fine).
A decimal number is basically two integers separated by ".".
Identify the position of "." and grab the two sides of the integer as integerPart, decimalPart
One caveat on getting the decimalPart is that the length of all the decimalParts should be same, if not, add "0"s in the suffix.
Add the integerPart, add the decimalPart and handle the carryForwards in the decimalPart.
So,
12.2 + 14.95
= (12 + 14) (20 + 95)
= 26 115
= 26+1 15
= 27.15

Answer 2

This is a quick and dirty implementation: no parameter check, no deep test only an idea of how you should process.
#include <stdio.h>
#include <stdlib.h>
typedef struct
{
int total_digits;;
int decimal_points;
int *number;
} NUMBER, *DECIMALNUMBER;
DECIMALNUMBER initilize(char *str)
{
DECIMALNUMBER result = calloc(1, sizeof(NUMBER));
int in_decimal = 0;
char *s;
int i;
for (s = str; *s; s++)
{
if (isdigit(*s))
{
result->total_digits++;
if (in_decimal)
{
result -> decimal_points++;
}
}
else if (*s == '.')
{
in_decimal = 1;
}
else
{
return NULL;
}
}
result->number = calloc(result->decimal_points, sizeof(int));
i=0;
for (s = str; *s; s++)
{
if (isdigit(*s))
{
result->number[i++] = (int)(*s - '0');
}
}
// printf("result->total_digits is %d\n",result->total_digits);
// printf("result->decimal_points is %d\n",result->decimal_points);
// printf("result is %d\n",result->number[--i]);
// printf("result is %d\n",result->number[--i]);
// printf("result is %d\n",result->number[--i]);
return result;
}
void print_number(DECIMALNUMBER p)
{
int i;
for (i=0; i<p->total_digits; i++)
{
if (i==p->total_digits - p->decimal_points) {
printf(".");
}
printf("%d", p->number[i]);
}
printf("\n");
}
DECIMALNUMBER sum(DECIMALNUMBER a, DECIMALNUMBER b)
{
int max_decimals = a->decimal_points>b->decimal_points ? a->decimal_points : b->decimal_points;
int max_digits_count = a->total_digits>b->total_digits ? a->total_digits : b->total_digits;
DECIMALNUMBER result = calloc(1, sizeof(NUMBER));
result->total_digits = max_digits_count;
result->decimal_points = max_decimals;
result->number = calloc(max_digits_count, sizeof(int));
int i1 = a->total_digits-1;
int i2 = b->total_digits-1;
int i3 = result->total_digits-1;
int remainder = 0;
int summed;
while (i1 >= 0 || i2 >=0)
{
int aa = i1 < 0 ? 0 : a->number[i1];
int bb = i2 < 0 ? 0 : b->number[i2];
summed = aa + bb + remainder;
result->number[i3] = summed % 10;
remainder = summed / 10;
i1--;
i2--;
i3--;
}
return result;
}
int main()
{
DECIMALNUMBER a = initilize("12.2");
DECIMALNUMBER b = initilize("16.7");
print_number(a);
print_number(b);
DECIMALNUMBER c = sum (a,b);
print_number(c);
return 0;
}