Example: insert "int " before the first character in lines 141 - 144 inclusive:
:141,144s/^\s*/&int /g
Before & After:
// Before:
upperBound = (y + 1 >= b->height) ? b->height : y + 2; // Exclusive
lowerBound = (y - 1 <= 0) ? 0 : y - 1; // Inclusive
lBound = (x - 1 <= 0) ? 0 : x - 1; // Inclusive
rBound = (x + 1 >= b->width) ? b->width : x + 1; // Exclusive
// After:
int upperBound = (y + 1 >= b->height) ? b->height : y + 2; // Exclusive
int lowerBound = (y - 1 <= 0) ? 0 : y - 1; // Inclusive
int lBound = (x - 1 <= 0) ? 0 : x - 1; // Inclusive
int rBound = (x + 1 >= b->width) ? b->width : x + 1; // Exclusive