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Summing up  zap-to-char

Now that we have seen how  search-forward and  progn work, we can see how the  zap-to-char function works as a whole.

The first argument to  kill-region is the position of the cursor when the  zap-to-char command is given--the value of point at that time. Within the  progn , the search function then moves point to just after the zapped-to-character and  point returns the value of this location. The  kill-region function puts together these two values of point, the first one as the beginning of the region and the second one as the end of the region, and removes the region.

The  progn function is necessary because the  kill-region command takes two arguments; and it would fail if  search-forward and  point expressions were written in sequence as two additional arguments. The  progn expression is a single argument to  kill-region and returns the one value that  kill-region needs for its second argument.

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