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https://github.com/TheAlgorithms/C
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29 lines
679 B
C
29 lines
679 B
C
/*
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code for computing nth catalan number
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*/
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#include <stdio.h>
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long int factorial(int x) // long int for more than 10 factorial
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{
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int i;
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long int fac; // fac stores x factorial
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fac = x;
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for (i = 1; i < x; i++) // loop to calculate x factorial
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{
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fac = fac * (x - i);
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}
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return fac; // returning x factorial
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}
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int main()
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{
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long int f1, f2, f3; // long int for more than 10 factorial
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int n;
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float C; // C is catalan number for n;
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scanf("%d", &n);
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f1 = factorial(2 * n);
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f2 = factorial(n + 1);
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f3 = factorial(n);
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C = f1 / (f2 * f3); // formula for catalan number for n
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printf("%0.2f", C);
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return 0;
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}
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