You’ve got some semicolons where you want commas:
for (i=1, j=0, k=150; i<=5; i++, j+=30, k-=30) { /* do work */ }
You should only have three “statements” inside your for
for( [init]; [test]; [increments]) { [block] }
To do multiple [inits] or [increments] you have to use the sometimes magical, but oft forgotten, comma operator