Linux下gcc編譯：
求解：
爲何將一個浮點型變量強制轉換爲int *指針會報錯， 但將一個char型變量強制轉換爲int * 指針則只是warning？web
#include<stdio.h>
{
int a = 4;
float b = 4.2;
char c = 'A';
int *p4 = NULL;
p4 = a; //warning: assignment makes pointer from integer without a cast
p4 = (int *)a;
p4 = b; //error: incompatible types when assigning to type ‘int *’ from type ‘double’
p4 = (int *)b; //error: cannot convert to a pointer type
p4 = c; //warning: assignment makes pointer from integer without a cast
p4 = (int *)c; //warning: cast to pointer from integer of different size
return 0;
}