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int inputd();
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void printd(int);
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void prints(char *c);
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int factorial(int n);
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void entry(){
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int n;
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prints("Enter n:\n");
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n = inputd();
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prints("n! = ");
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printd(factorial(n));
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prints("\n");
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}
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int factorial(int n){
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if(n > 1){
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return n*factorial(n - 1);
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}
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return 1;
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}
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