Checking input from program

Okay here's the problem I can't seem to figure out. I have a program called Calc, and the user enter a number on the command line such as 239.43. The inputed number gets stored in char *argv[] making, the 239.43 stored in argv[1] I need to test that for a decimal point so I can determine is it's a float or int. I just cant think of how to test it to check

 

Okay I tried that and it didn't work I'll post my code

Code:

#include<stdio.h>

#include<string.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 iLoop;

    //Run the Loop though until the end of the string is located
    for(iLoop = 0; *(szString + iLoop) != '\0' ; iLoop++){

              if(*(szString + iLoop) != chr){

                            printf("Value inputed is float\n");

              }

              else

                            printf("Value inputed is int\n");

    }

//Return the array when the decimal is found
return (szString + iLoop);

}

When I run ./calc 200 + 200 or ./calc 200.20 + 200 no matter what I get return it's a float.