okay i came up with some code that reads in a file, and on the file are names of shapes and their widths/lengths. after the file is read in, it tokenizes whats in the file, it then calculates what shape it is and then takes the information and calculates the area, perimeter, volume, and etc of the shape.

the program does everything i need it to do, but when the input file has a shape with insufficient information to calculate its lengths, the program stops where the shape has insufficient info and crashes.

i need it to see if the shape doesn't have enough information to calculate, and if it doesn't it will output the name of the shape and that it is invalid object.

any help would be greatful.

here is my code that i came up with:

```
#include <iostream>
using std::cin;
using std::cout;
using std::endl;
#include <fstream>
using std::ifstream;
#include <cmath>
#include <cstring>
using std::strtok;
using std::strcmp;
#include <cstdlib>
const int MAX_CHARS_PER_LINE = 50;
const int MAX_TOKENS_PER_LINE = 4;
const char* DELIMITER = " ";
void squareCalc(double);
void rectangleCalc(double, double);
void circleCalc(double);
void cubeCalc(double);
void prismCalc(double, double, double);
void sphereCalc(double);
void cylinderCalc(double);
void cylinderCalc(double, double);
void triangleCalc(double, double, double);
void invalidObj(int);
int main()
{
cout << endl;
cout << "Description: Calculates area, perimeter, surface area, and volume" << endl;
cout << "of 6 different geometric objects." << endl;
cout << endl;
ifstream fin;
fin.open("geo.txt");
if(!fin.good())
return 1;
char* token[MAX_TOKENS_PER_LINE] = {0};
double squareSide = 0;
double rectangleSide1 = 0;
double rectangleSide2 = 0;
double circle = 0;
double cubeSide = 0;
double prismSide1 = 0;
double prismSide2 = 0;
double prismSide3 = 0;
double sphere = 0;
double cylinder1 = 0;
double cylinder2 = 0;
double triangleSide1 = 0;
double triangleSide2 = 0;
double triangleSide3 = 0;
while(!fin.eof())
{
char buf[MAX_CHARS_PER_LINE];
fin.getline(buf, MAX_CHARS_PER_LINE);
int n = 0;
token[0] = strtok(buf, DELIMITER);
if(token[0])
{
for(n = 1; n < MAX_TOKENS_PER_LINE; n++)
{
token[n] = strtok(0, DELIMITER);
if(!token[n]) break;
} //for
if((strcmp(token[0], "SQUARE") == 0))
{
squareSide = atof(token[1]);
squareCalc(squareSide);
} //if
if((strcmp(token[0], "CIRCLE") == 0))
{
circle = atof(token[1]);
circleCalc(circle);
} //if
if((strcmp(token[0], "CUBE") == 0))
{
cubeSide = atof(token[1]);
cubeCalc(cubeSide);
} //if
if((strcmp(token[0], "SPHERES") == 0))
{
sphere = atof(token[1]);
sphereCalc(sphere);
} //if
if((strcmp(token[0], "RECTANGLE") == 0))
{
rectangleSide1 = atof(token[1]);
rectangleSide2 = atof(token[2]);
rectangleCalc(rectangleSide1, rectangleSide2);
} //if
if((strcmp(token[0], "PRISM") == 0))
{
prismSide1 = atof(token[1]);
prismSide2 = atof(token[2]);
prismSide3 = atof(token[3]);
prismCalc(prismSide1, prismSide2, prismSide3);
} //if
if((strcmp(token[0], "CYLINDER") == 0))
{
cylinder1 = atof(token[1]);
cylinder2 = atof(token[2]);
cylinderCalc(cylinder1, cylinder2);
} //if
if((strcmp(token[0], "TRIANGLE") == 0))
{
triangleSide1 = atof(token[1]);
triangleSide2 = atof(token[2]);
triangleSide3 = atof(token[3]);
triangleCalc(triangleSide1, triangleSide2, triangleSide3);
} //if
} //if
cout << endl;
} //while
cout << endl;
cout << "Press Enter to continue..." << endl;
cin.get();
return 0;
} //main
void squareCalc(double side)
{
double perimeter;
double area;
perimeter = side * 4;
area = side * side;
cout << "SQUARE side=" << side << " perimeter=" << perimeter;
cout << " area=" << area;
} //squareCalc
void rectangleCalc(double side1, double side2)
{
double perimeter;
double area;
perimeter = (side1 * 2) + (side2 * 2);
area = side1 * side2;
cout << "RECTANGLE side1=" << side1 << " side2=" << side2;
cout << " perimeter=" << perimeter << " area=" << area;
} //rectangleCalc
void circleCalc(double side1)
{
double circumference;
double area;
double pow(double, int);
double pie = 3.14;
circumference = 2 * pie * side1;
area = pie * pow(side1, 2);
cout << "CIRCLE radius=" << side1;
cout << " circumference=" << circumference << " area=" << area;
} //rectangleCalc
void cubeCalc(double side1)
{
double volume;
double surfaceArea;
double pow(double, int);
volume = pow(side1, 3);
surfaceArea = 6 * pow(side1, 2);
cout << "CUBE side=" << side1;
cout << " volume=" << volume << " surface area=" << surfaceArea;
} //rectangleCalc
void prismCalc(double side1, double side2, double side3)
{
double volume;
double surfaceArea;
volume = side1 * side2 * side3;
double lw = side1 * side2;
double lw2 = 2 * side1 + 2 * side2;
surfaceArea = 2 * lw + lw2 * side3;
cout << "PRISM side1=" << side1 << " side2=" << side2 << " side3=" << side3;
cout << " volume=" << volume << " surface area=" << surfaceArea;
} //prismCalc
void sphereCalc(double side1)
{
double volume;
double surfaceArea;
double pie = 3.14;
volume = (4/3) * pie * pow(side1, 3);
surfaceArea = 4 * pie * pow(side1, 2);
cout << "SPHERE radius=" << side1;
cout << " volume=" << volume << " surfaceArea=" << surfaceArea;
} //rectangleCalc
void cylinderCalc(double side1, double side2)
{
double volume;
double surfaceArea;
double pie = 3.14;
volume = 2 * pie * pow(side1, 2) * side2;
surfaceArea = 2 * pie * pow(side1, 2) + 2 * pie * side1 * side2;
cout << "CYLINDER side1=" << side1 << " side2=" << side2;
cout << " volume=" << volume << " surfaceArea=" << surfaceArea;
} //rectangleCalc
void triangleCalc(double side1, double side2, double side3)
{
double perimeter;
double area;
float half = 1 / 2;
perimeter = side1 + side2 + side3;
area = half * side1 * side2;
cout << "TRIANGLE side1=" << side1 << " side2=" << side2 << " side3=" << side3;
cout << " perimeter=" << perimeter << " area=" << area;
} //triangleCalc
```

here is the WORKING input file:

```
SQUARE 14.5
RECTANGLE 14.5 4.65
CIRCLE 14.5
CUBE 13
PRISM 1 2 3
SPHERES 2.4
CYLINDER 50 1.23
TRIANGLE 1.2 3.2 3.4
SQUARE 2.4
```

here is the NON-WORKING input file (CYLINDER is added to the end with not enough info):

```
SQUARE 14.5
RECTANGLE 14.5 4.65
CIRCLE 14.5
CUBE 13
PRISM 1 2 3
SPHERES 2.4
CYLINDER 50 1.23
TRIANGLE 1.2 3.2 3.4
SQUARE 2.4
CYLINDER 5
```