if (x == 5)
{
    // Loop on j here
    for (j = 0; j < Index; j++)
        printf("x = %i", j);
}
else
    while (i < 5) i++;  

CONDITIONAL_BEGIN
LOOP_BEGIN
DISPLAY
LOOP_END
CONDITIONAL_END
CONDITIONAL_BEGIN
LOOP_BEGIN
ARITHMETIC
LOOP_END
CONDITIONAL_END

Figure 1: Token substitution. (a) Original program; (b) program structure profile.