Thread: Problem with if statements in the second half of the code. See comments for problem.

1. Problem with if statements in the second half of the code. See comments for problem.

I am having a problem with the part of my code which compares the rectangle area with the triangle area. I cannot get the if else statements to run. The program terminates before the validation takes place. Im not sure what I am doing wrong, or if I must place the statement in another location.
Code:
Int main(void){
printf("Peter Donchik\n");

double Tri_side_A;
double Tri_side_B;
double Tri_side_C;
double Tri_length;
double Tri_width;
double Tri_area;
double Tri_perimeter;
double Tri_sides;
double Rec_width;
double Rec_length;
double Rec_area;

printf("What is the length of side A on the triangle?\n");
scanf("%lf", &Tri_side_A);

if((Tri_side_A >=1) && (Tri_side_A <= 100))
{
printf("What is the length of side B on the triangle?\n");
scanf("%lf", &Tri_side_B);

if((Tri_side_B >= 1) && (Tri_side_B <= 100))
{
printf("What is the length of side C on the triangle?\n");
scanf("%lf", &Tri_side_C);

if((Tri_side_C >= 1) && (Tri_side_C <= 100))
{
if((Tri_side_A < (Tri_side_B + Tri_side_C)) && (Tri_side_B < (Tri_side_C + Tri_side_A)) && (Tri_side_C < (Tri_side_A + Tri_side_B)))
{
Tri_perimeter=Tri_side_A+Tri_side_B+Tri_side_C;
Tri_sides=(Tri_perimeter/2);
Tri_area=sqrt(Tri_sides*(Tri_sides - Tri_side_A)*(Tri_sides - Tri_side_B)*(Tri_sides - Tri_side_C));
printf("The perimeter of the triangle is %.1f\n", Tri_perimeter);
printf("The area of the triangle is %.1f\n", Tri_area);

}
else
{
printf("The values entered do not make a valid triangle\n");
}
}
else
{
printf("The value for side C is out of range\n");
}
}
else
{
printf("The value for side B is out of range\n");
}
}
else
{
printf("The value for side A is out of range\n");
}
printf("What is the length of the rectangle?\n");
scanf("%lf", &Rec_length);
printf("What is the width of the rectangle?\n");
scanf("%lf", &Rec_width);
Rec_area=(Rec_length*Rec_width);
printf("The area of the rectangle is %.1f.\n",Rec_area);
//this works fine//

/*Here is where my code terminates.i cannot figure out how to have the program run the following
if statements to compare the two areas and tell which is greater.*/
if(Rec_area>Tri_area)
{
printf("The rectangle has a greater area.\n");

if(Rec_area<Tri_area)
{
printf("The Triangle has a greater area.\n");

}
else
printf("The area of both the triangle and rectangle are the same.\n");
}

return 0;
} 2. Please explain why you think you code will ever have both "Rec_area>Tri_area" and "Rec_area<Tri_area" true.

NOTE: Nesting the second if inside the first is wrong. You likely need an else if instead of the second if.

Tim S. 3. For starters change the first line to:
Code:
#include <stdio.h>
#include <math.h>

int main(void){
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