C

Abstract:

C is a very old, lower level, Object Orientated, Programming Language that was designed as a improved alternative to D (Programming Language).

To compile and then execute a C program run:

clang source.c -o program
./program

To generate the code after the preprocesor stage use:

clang source.c -E -o source.e

To generate the intermediate representation use:

clang source.c -emit-llvm -S -o source.llvm 

To generate the assembly code:

clang source.c -S source.s

To generate machine code:

clang source.c -c -o source.o

Concepts in C:

Fibonacci:

Recursively:

int fib(int x, int x1, int x2) {
	if (x==0) {
	return x2;
	} else {
		return fib(x-1, x1 + x2, x1);
	}
}
 
int main() {
	int fib_6 = fib(6,0,1);
}

Iteratively:

int fib(int x) {
int x1 = 0;
int x2 = 1;
 
while (x>1) {
	 int xtmp = x1 + x2;
	 x1 = x2;
	 x2 = xtmp;
	 x = x - 1;
}
return x2;
}
 
int main(){
	int fib_6 = fib(6);
}