Question

i don’t know if some body asked this question before or not, but here is mine:
if i have following code; what the value of total will be?
Because the output is always in +ve value not the -ve, or please guide me where i am wrong.Thankyou.
P.S: Iam using Turbo C 3.o compiler.

void subtract (void)
        {
            float f1;
            float f2=0.0;
            float f3=0.0;
            float total;
            printf("Enter numbers to be subtract:'q' to quit.\n ");
            while (scanf("%f",&f1)==1)
                {
                    f3=f1+f2;
                    total=f3-f1;
                    printf("Enter another # to be subtract:'q' to quit.\n ");
                    scanf("%1.0f",&f1);
                }
            printf("Subtraction Total = %1.0f",total);
            getch();
        }

//I am using now for simple subtraction like 3.6-9.2, i am not getting -5.6 instead I am getting 9 (This for Example)

I done it what i just want by do the following; Thank you all

void subtract (void)
            {
                float f1;
                float f2;
                int status1,status2;
                float total;

                printf("Enter first number to subtract:'n' to quit.\n ");
                status1=scanf("%f",&f1);
                printf("Enter second number to be subtract from first:'n' to quit.\n ");
                status2=scanf("%f",&f2);
                while (status1==1 && status2==1)
                    {

                        total = f1 - f2;
                        printf("total=%1.2f \n",total);
                        printf("Enter first number to subtract:'n' to quit.\n ");
                        status1=scanf("%f",&f1);
                        printf("Enter second number to be subtract from first:'q' to quit.\n ");
                        status2=scanf("%f",&f2);
                    }
                printf("Subtraction Total = %1.1f",total);
                getch();
            }

Answer 1

I done it what i just want by do the following; Thank you all

void subtract (void)
{
float f1;
float f2;
int status1,status2;
float total;

            printf("Enter first number to subtract:'n' to quit.\n ");
            status1=scanf("%f",&f1);
            printf("Enter second number to be subtract from first:'n' to quit.\n ");
            status2=scanf("%f",&f2);
            while (status1==1 && status2==1)
                {

                    total = f1 - f2;
                    printf("total=%1.2f \n",total);
                    printf("Enter first number to subtract:'n' to quit.\n ");
                    status1=scanf("%f",&f1);
                    printf("Enter second number to be subtract from first:'q' to quit.\n ");
                    status2=scanf("%f",&f2);
                }
            printf("Subtraction Total = %1.1f",total);
            getch();
        }