A programming tool for providing a graphical representation of the relationships among a plurality of nested blocks integrated into a processed "C" source code listing is disclosed. For each line of code including a "{" character, an outbound arrow is appended. Similarly, for each line of code including a "}" character, an inbound arrow is appended, and the inbound and outbound arrows are tabbed into vertical alignment. A "depth number" is developed for each line now having arrows by performing an increment when a line having an outbound arrow is encountered and a decrement for the starting depth number value of the next line when a given line having an inbound arrow is encountered. The depth numbers, and also one or more (as indicated by the depth number for a given line) right justified vertical line segments, are appended to the lines having outbound or inbound arrows. Intermediate lines have appended the same number of vertical line segments as the last arrowed line if it was outbound or one less than the last arrowed line if it was inbound. Then, horizontal line segment characters are entered in the spaces between the depth number and the leftmost vertical line segment in a given line having an outbound or inbound arrow.
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