List function prototype before main function - C Function

Description

List function prototype before main function

Demo Code

#include<stdio.h>

void sqr_it(int *i); /* prototype */

int main(void)
{
   int x;/*from   ww w .  j a v a  2s  .  co m*/

   x = 10;

  // sqr_it(x);  /* type mismatch */

   printf("%d", x);
   return 0;
}
void sqr_it(int *i)
{
   *i = *i * *i;
}

Result

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Related Tutorials

• Defining a Function
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• Define and use variable in your own function
• Use function definition as function prototype
• To create an in-line function, precede its definition with the inline keyword. For example, in this program, calls to the function max( ) are optimized: