# Issue

*This Content is from Stack Overflow. Question asked by Nxru *

I am trying to do a simple c program code in which I need to find the area of a triangle using the heron’s formula with the given inputs.

The output is always 0.00 and the error trappings using do-while aren’t working as well.

I hope someone can help me.

It seems like I have a problem with the parameters or the calculations itself.

As well as the error trappings aren’t working

```
#include <stdio.h>
#include <conio.h>
#include <math.h>
void input(int *, int *, int *);
int calculate(int, int, int, float *);
void output(float);
int main(void)
{
char response;
int a, b, c;
float area;
do{
input(&a, &b, &c);
calculate(a, b, c, &area);
output(area);
printf("nn Do you want to try again?(Y/N): ");
scanf(" %c", &response);
system("cls");
}while(response == 'Y' || response == 'y');
return 0;
}
void input(int *a, int *b, int *c)
{
int i;
do{
printf("nSide a: ");
scanf("%d", a);
if(a < 0 || a == 0)
{
i = 1;
printf("nThe value is incorrect, Please input a number that is greater than 0");
}
}while(i == 11);
do{
printf("nSide b: ");
scanf("%d", b);
if(b < 0 || b == 0)
{
i = 1;
printf("nThe value is incorrect, Please input a number that is greater than 0");
}
}while(i == 1);
do{
printf("nSide c: ");
scanf("%d", c);
if(c < 0 || c == 0)
{
i = 1;
printf("nThe value is incorrect, Please input a number that is greater than 0");
}
}while( i == 1);
return;
}
int calculate(int a, int b, int c, float *area)
{
*area = sqrt(((a+b+c)/2)*(((a+b+c)/2)-a)*(((a+b+c)/2)-b)*(((a+b+c)/2)-c));
return;
}
void output(float area)
{
printf("nnThe area of the triangle is %.2f", area);
return;
}
```

# Solution

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