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#include<string.h>
#include<stdlib.h>
 
int func(int);
 
int main()
{
    int (*ptr1)(), (*ptr2)();
 
    ptr1 = main;
    ptr2 = func;
 
    printf("main関数のアドレス = %p, ptr1 = %p\n", main, ptr1);
    printf("func関数のアドレス = %p, ptr2 = %p\n", func, ptr2);
 
    return 0;
}
 
int func(int x)
{
    printf("x = %d\n", x);
    return 0;
}

prog.cpp: In function ‘int main()’:
prog.cpp:11:10: error: invalid conversion from ‘int (*)(int)’ to ‘int (*)()’ [-fpermissive]
     ptr2 = func;
          ^
prog.cpp:13:69: error: ‘printf’ was not declared in this scope
     printf("main関数のアドレス = %p, ptr1 = %p\n", main, ptr1);
                                                                     ^
prog.cpp: In function ‘int func(int)’:
prog.cpp:21:25: error: ‘printf’ was not declared in this scope
     printf("x = %d\n", x);
                         ^

Standard output is empty