i/o: set value x (long) before it is used by a function

gmn · #1 17-Nov-2003, 16:08

hopefully this will be an easy one for somebody.......

i can get this working using c++ but not with c (which i never learnt) and i need this as part of an assignment. my problem is that i cant seem to make scanf behave line cin, all i want is for the user to set value x (long) before it is used by a function. function works fine if the value is entered directly into the code.

heres the bit i mean,

CPP / C++ / C Code:

double factorial(double  n);
double power(double a, double b);
double doSine(double x);

double x;

printf("to run sin(x) function please enter value x: ");
scanf("%f", &x);

printf("\n%f", x); //at this point x is always some huge negative
//number, and if i initialise x above it retains its value regardless
//of scanf (being run as console app.)

printf("factorial of x is %f\n",factorial(x));

printf("x to power 3 = %f\n", power(4, 3));
printf("sine(x) = %f\n", doSine(x));

what am i missing? i tried getchar() but i'm not sure that likes long numbers.

gmn · #2 18-Nov-2003, 01:12

got it now - its scanf("%lf" isnt it............took suprisingly long to find that using google.

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