Explanation of "float" and "ftr[]" in C++

[fatma1000]

please explean the mean of
1)
float *x
*x=a*cos(t);

2)
ftr[1]->HY[z+1]=ftr[0]->HY[z+1]-ftr[0]->EX[z+1];

regards

Added after 2 minutes:

sorry explain
not explean

 

[zeeshanzia84]

Re: help4 c++

1)

float *x

declares a pointer named x

you can make the pointer POINT to a memory location (e.g. a variable of type float) by

float a;
x = &a;

so that *x will give you the value the is stored in 'a', whereas x (without the asterisk) gives you the address to the memory location pointed to by x.





*x=a*cos(t)

stores a*cos(t) - a multiplied by cosine of t
into the memory location pointed to by x






2) ftr[1]->HY[z+1]=ftr[0]->HY[z+1]-ftr[0]->EX[z+1];

ftr is the pointer to a STRUCT. In order to access the members of the structure you have to use the -> operator.

thus, this line subtracts EX[z+1] which is member of ftr[0] from HY[z+1] which is also a member of ftr[0].....and stores the result in HY[z+1] of ftr[1].




YOU NEED TO STUDY POINTERS THOROUGLY....
some nice tutorials and a WONDERFUL C/C++ messageboard can be found at

www.cprogramming.com




--- thanks in advance for clicking HELPED ME