Decting user input for float or int

[docmur]

Okay heres my problem I have a problem called Calc which the user enters 2 numbers and a sign to be done with what is entered
EX:

./calc 200 + 200
or
./calc 200.20 + 200

Okay thats easy where I can't seem to get, my prof wants the input checked to see if the char *argv[1] or char *argv[2] contains a float or int. so I have to check for a decimal point.

I know I can search the number like a string because it's in an array of char but my code seems to not work for that. So I tool another approach and I'm use strtol to convert it to a int. If the decimal point is found then I can assume the number is float.

Here is my code for examimation:

#include<stdio.h>
 
#include<stdlib.h>
#include<string.h>
#include<errno.h>
#include<limits.h>
 
 
 
char *FindChr(char *szString, char chr);
 
int main(int argc, char *argv[])
 
{
 
float fValueOneInputed;
 
float fValueTwoInputed;
float fCalculatorStore;      
 
    //Test the input to see if the value entered if Float or Int
    FindChr(argv, '.');
    //Get the first input value in char form and take it to a float          
    sscanf(argv[1],"%f",&fValueOneInputed);
 
    //Get the first input value in char form and take it to a float    
    sscanf(argv[3],"%f",&fValueTwoInputed);
 
    if(*argv[2] == '+')printf("%0.3f", fCalculatorStore = fValueOneInputed + fValueTwoInputed);
 
    if(*argv[2] == '-')printf("%0.3f", fCalculatorStore = fValueOneInputed - fValueTwoInputed);
 
    if(*argv[2] == 'x')printf("%0.3f", fCalculatorStore = fValueOneInputed * fValueTwoInputed);
 
    if(*argv[2] == '/')printf("%0.3f", fCalculatorStore = fValueOneInputed / fValueTwoInputed);
return 0;
 
}
 
char *FindChr(char *szString, char chr)
 
{
 
int base;
int iLoop;
long lTestVal;
char *str;
char *endptr;
str = szString[1];
base = 0;
errno = 0;
lTestVal = strtol(str, &endptr, base);
 
/* Check for Error's */
if((errno == ERANGE && (lTestVal == LONG_MAX || lTestVal == LONG_MIN)) || (errno != 0 && lTestVal == 0)){
    perror("strol");
    exit(EXIT_FAILURE);
}
if(*endptr != '\0'){
    printf("Further character after number: %s\n", endptr);
    exit(EXIT_SUCCESS);
}    
return;
}
 

I got the implimentation from man strtol and I've read that man page like 10 times but 2 problems exist.

1)It always segment faults
2)It is implimented correctly

Anyhelp would be appreached

Thanks

DOCMUR

[sicarie]

Moving to C++ Forum (Please double check where you are next time. Thanks!)

[docmur]

????Why the code is C not C++

[sicarie]

????Why the code is C not C++

Because you posted in the Articles forum, and the Proper forum name is C/C++ (we do both).