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 #include 
 int f1(int, int); /* Function prototype */
 int f2(int); /* Function prototype */  

int main()
 {   
   int a = 2, b = 3, c;    
   c = f1(a, b);   
   printf("c = %d\n", c);     
   return 0; 
 } 
int f1(int a, int b)
 {    
    return ( f2(20) ); 
 }  
 int f2(int a) 
 {     
    return (a * a); 
 }