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;
}

---

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.

Edit: Add link If Statements in C - Cprogramming.com

Tim S.

For starters change the first line to:

Code:

---

#include <stdio.h>
#include <math.h>

int main(void){
...

---

then link in the math library. For gcc add "-lm" to link in the math library.