#include <stdio.h>
#include <stdio.h>

int func1(void)
{
printf("call to func1\n");
return 0;
}

int func2()
{
printf("call to func2\n");
return 0;
}

typedef int (*intXint2int)(int,int);  // intXint2int is the name

int add(int x,int y) {
  return x+y;
  }

int mult(int x,int y) {
  return x*y;
  }

intXint2int nuts1() {
  return add;
  }

int nuts2(intXint2int f,int x,int y) {
  return f(x,y);
  }

int main()
{
int (*f)();
int (*g)(void);
intXint2int h[2]={add,mult};

f=func1;
g=func2;
f();
g();

g=func1;
f=func2;
f();
g();

for (int i=0;i<5;i++) {
  printf("i=%d",i);
  for (int j=0;j<5;j++)
    printf(" j=%d + %d * %d",j,h[0](i,j),h[1](i,j));
  printf("\n");
  }

printf("nuts1(100,23)=%d\n",nuts1()(100,23));
printf("nuts2(mult,100,23)=%d\n",nuts2(mult,100,23));
}