Is there any way generalise program specific seting in vs code?

Question

I was working with pow() function in c using vscode. And I want to use a variable in exponent parameter of power function i.e. pow (2, i). But i was getting error so, I used gcc programName.c -lm during compilation in terminal. Is there any way by which I can use normal compilation command like gcc programName.c and get output of program with same problem.

n = 10;
h = 0;
while (n > pow(2, h))
   h++;
printf("\n%d\n", h);

error: /tmp/ccptU1ZR.o: In function main': BinaryTree.c:(.text+0xd9): undefined reference topow' collect2: error: ld returned 1 exit status The terminal process terminated with exit code: 1

expected output : 4

Using `pow` for calculation of integer powers of `2` is an overkill. Have you heard of bit shifting? — Eugene Sh., Oct 28 '19 at 14:59
`2^n` is the same as shifting the number `1` n binary positions left. Or `1 << n` in C. There are some limitations of course, but this will give you a kickstart. — Eugene Sh., Nov 06 '19 at 14:27

score 0 · Accepted Answer · answered Oct 28 '19 at 15:03

The -lm option is not a different type of compilation, rather it is telling the compiler (actually the linker) where to find the meaning or definition of the pow() function. So use -lm with no worries, all it says is that there are math functions in the code otherwise gcc will not bother looking on its own.

Is there any way generalise program specific seting in vs code?

1 Answers1