52 lines
1.4 KiB
Zig
52 lines
1.4 KiB
Zig
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const std = @import("std");
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pub fn main() !void {
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const reader = std.io.getStdIn().reader();
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const writer = std.io.getStdOut().writer();
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const userNumberInput: u128 = try getInputNumber(writer, reader);
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const calcedFact = try calcFact(userNumberInput);
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try writer.print("Calculated number: {d}\n", .{calcedFact});
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}
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pub fn getInputNumber(writer: anytype, reader: anytype) !u128 {
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var buffer: [256]u8 = undefined;
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while (true) {
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try writer.print("Enter a number \n", .{});
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try writer.print("> ", .{});
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const amountInputBytes = try reader.read(&buffer);
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const input_slice = buffer[0..(amountInputBytes - 1)];
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const result = std.fmt.parseInt(u128, input_slice, 10) catch |err| {
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switch (err) {
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error.InvalidCharacter => {
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try writer.print("Error: Invalid character in input.\n", .{});
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},
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error.Overflow => {
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try writer.print("Error: Too large.\n", .{});
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},
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}
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try writer.print("\n", .{});
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continue;
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};
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return result;
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}
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}
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pub fn calcFact(maxNum: u128) !u128 {
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if (maxNum == 0) {
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return 1;
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}
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const multValue: u128 = try calcFact(maxNum - 1);
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return (maxNum * multValue);
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}
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// Bei start wird Zufallszahl gewählen
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// Nutzer sucht dann manuel mit binary search nach der zahl
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