Go further: programs & sub-programs

1. The preceding program/algorithm computes factorial(n=4) and can be represented as follow:

And this representation can be specified by a C program as:

int fact(int n) { // sub-program declaration
  int r;
  ...
  return r;
}

A program with no parameter and no result (void) such as the main program will be declared as follow:

void main() {
  ...
}

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