c++ - Why does my function print '0'? -

here code, don't know why happen:

#include <stdio.h>  void foo(float *);  int main() {     int = 10, *p = &i;     foo(&i); }  void foo(float *p) {     printf("%f\n", *p); } 

output :

0 

you calling function expecting float* pointer int. in c++ error , code not compile. in c warning , undefined behaviour anyway.