C/C++ :: Program That Adds Feet As Well As Inches And Outputs In Inches?

This program must take user input(from stdin) that contains both a number and then a punctuation character, either a single quote(') or double quote(") that specifies feet or inches. It keeps prompting the user to enter a length until the user enters the sentinel value of 0. For example:

Enter a measurement and unit: 1'
Enter a measurement and unit: 2"
Enter a measurement and unit: 0
Total: 14 inches

The ultimate goal of this program is to then write an Assembly language program that is structurally similar and makes use of these 4 functions:

void printStr(char *)
Arguments:
edi = address of null-terminated string to print
Returns:
Nothing

[Code] ...

So here is what I have:

int main() {
char value[50];
char *end;
int sum = 0;
long conv;
while(conv !=0)

[Code] .....

I was told to use fgets instead of scanf for for stdin to parse the number and the quotation marks. I think I converted the number from string to integer correctly with strtol, but I really do not know how to obtain the (") or (') from user input so the program knows whether to convert the number to feet or just inches. No matter what I type in, even if it's without a quotation mark, it still multiplies the number by 12. In the IF and ELSE IF statement, it should state

if(value = ''')
and...
else if(value = '"')