C programming step by step

-std=gnu99

to compile below, we need to use

 gcc -o 9th 9th.c -std=gnu99

since test is initialized in the for loop

#include <stdio.h>

void main ()

{

for ( int  test=10;test>0;test=test-2)

{printf("test=%d\n",test);

}}

There are some other c compile options, like previously we mentioned -lm.