c - How to delete the first digit of a given number? -

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how can delete first digit of given number using user defined function (suppose function deltop) ?

for ex.,

x=deltop(1748);

i want value of x 748.

would tell me how write function ?

you can divide number ten, until number < 10.

1748/10 = 174 174/10 = 17 17/10 = 1

now know iteration count 3 , have 1 multiplier , can use following formula:
yournumber - 1 (this 1 "multiplier") * 10^3 (the 3 "iteration count") = 748


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