ITERATION

In C, simple iteration is performed with a for loop, for example

for (j=2;j<=1000;j++) {
	b[j]=a[j-1];
	a[j-1]=j;
}

Notice how we always indent the block of code that is acted upon by the control structure, leaving the structure itself unindented. Notice also our habit of putting the initial curly brace on the same line as the for statement, instead of on the next line. This saves a full line of white space, and our publisher loves for it.