The stars2 function using a prototype

The same function as before but with a prototype declared at the top of the program.

/* A function with a prototype */ /* You can put only the prototype (header) on top */ /* and define the function at the bottom */ #include <stdio.h> /* the function prototype */ void stars2 (int n); /* the main program */ int main (void) { int a; a=10; /* the argument may be a constant, a variable or an expression */ stars2 (20); stars2 (a); stars2 (a+2); return (0); } /* the function definition */ void stars2 (int n) { int i; /* a loop displaying a star at each iteration */ for (i=1; i<=n; ++i) { printf ("*"); } /* change line after each series */ printf ("\n"); } Legend: preprocessor directives | variable declarations | main program | helper functions | user-defined structures | comments

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